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UNIVERSITY OF NIGERIA
NSUKKA
DEPARTMENT OF ECONOMICS
THE ROLE O F AGRICULTURE IN ECONOM IC GROWTH: THE
NIGERIAN EXPERIENC E.
AN M.SC. PROJECT PROPOSAL S,UBMITTED TO THEDEPARTMENT OF ECONOM ICS'
UNIVERSITY OF NIGERIA
NSUKKA
OGUCHI, CHINWEUBA BENJAMIN .
PG/M.SC/06/42027
SUPERVISOR: PROF. F.E. ONAH
JULY, 2008.
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CHAPTER ONE
1.0 : NTRODUCTION
1.1 : BACKGROUND INFORMATION
The modern world has transformed into one global village, thanks to advancementin science and technology(STM).The implication is that, events in one part of the
world have some effects on some, if not all other parts of the global community.
This is why for nearly half a century, the primary focus of the world has been on
ways to accelerate the growth rate of national incomes. Beefing up the growth rate
of national incomes, is an issue that bothers on economic growth. Hence,
economists and politicians from all nations, rich and poor, capitalist, socialist and
mixed, have w orshipped at the shrine of economic growth.
Econom ic growth is perhaps, one concept that has not lent itself to easy definition.
This development notwithstanding, Schumpeter (2005), defines it as, "a gradual
and steady changein the long-run which comes by a gradual increase in the rate of
savings and population". The gross domestic product is a major growth. (economic) indicator. This presupposes that all sectors of an economy make their
inputs to the economic growth of the economy. Agriculture certainly is one such
sector.
Agriculture in the context of the Nigerian economy, is tied with various sectors
and is essential for generating broad-based growth necessary for development. It is
fundamental to the sustenance of life and is the bedrock of economic growth,
especially in the provision of adequate and nutritious food so vital for human
development and raw materials for industry.
Economic history provides us with ample evidence that an agricultural revolutionis a fundamental pre-condition. for economic growth, especially in developing
countries (Woolf and Jones, 1969; Oluwasanmi, 1966; Eicher and Witt, 1964).
The agricultural sector has the potential to be the industrial and economic
springboard from which a country's growth can take off. The Brazilian experience
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is a striking example of how agriculture can advance beyond its primary function
of supplying food and fibre. Through its different spheres of activities at both
macro and micro levels, the agricultural sector is strategically positioned to have a
high multiplier effect on any nation's quest for socio-economic and industrial
growth. It is undisputable that a sustained agricultural growth has been highlyinstrumental to the rapid rural transformation, the empowerment of peasants and
alleviation of abject poverty in countries like Brazil,Malaysia,China, etc.
Interestingly, the Nigerian economy, like that of Brazil during the first decade
after independence, could reasonably be described as agrarian because agriculture
served as the engine of growth of the over-all economy (Ogen, 2003).
1.2: STATEMENT OF TH E PROBLEM
From the standpoint of occupational distribution and contribution to the GDP,
agriculture was the leading sector up to the sixties. During this period, Nigeria was
the world's largest producer of cocoa, largest exporter of palm kernel, largest
producer and exporter of palm oil. Nigeria was also a leading exporter of other
commodities such as cotton, groundnut, rubber and hides and skin (Alkali, 1971).
The agricultural sector contributed over 60% of the GDP in the 1960s and despitethe reliance of Nigerian peasant farmers on traditional tools and indigenous
farming methods, these farmers produced 70% of Nigeria's exports and 95% of its
food needs (Lawa l, 1997). However, the agricultural sector suffered neglect during
the hey-days of the oil boom in the 1970s. Since then, Nigeria has been witnessing
extreme poverty and insufficiency of basic food items. Historically, the roots of
the crisis in the Nigerian economy lie in the neglect of agriculture and the
increased dependence on a mono-cultural economy based on oil. The agricultural
sector now accounts for less than 5% of Nigeria's GDP (Olagbaju and Falola
1966).
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Agriculture's contribution to GDP in selected countries with DFID
presence for the period 2000-2004
1Ghana 136.00 ISierra Leone 152-40 I
Country
Ethiopia
I I 1
Malawi 136.70 ISudan 139.19p a
I I I
141.87 1Tanzania 144.66
Value added as %
of GDP
42.33
RepublicSource: World Bank (2005)
Country
Nigeria
Co ngo democratic.
DFID: The department for International Development-- An NGO .
Value added as %
of GDY
31.18
57.88
The table above clearly shows the great disparity in the agricultural value added as
percentage of GDP with reference to Nigeria as compared to other countries
named above . Such disparity indicates the presence of an econom ic problem.
Previous studies on Agriculture and Nigeria's economic growth applied a general
equilibrium model (G TAP) which was based on the assumption of constant returns
to scale among others. Constant returns to scale is not a known feature of
agricultural productivity (Land) and therefore, constitutes a gap in research that
yearns for urgent attention. This study will adopt a methodology that will ensure
the total captivity of productivity on land--- constant, increasing or decreasingreturns to scale. This certainly, will close the gap created by earlier investigations.
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1.3: RESEARCH QUESTIONS
a) What are the effects of the neglect of agriculture on Nigeria's economic
growth?
b) What factors determine the dwindling contribution of agriculture to
Nigeria's economic growth?
1.4: OBJECTIVES OF THE STUDY
The objectives of this study include:
. a) To determine the effects of the neglect of agriculture on Nigeria's economicgrowth.
b) To identify the factors responsible for the dwindling contribution of
agriculture to Nigeria's economic growth.
1.5: HYPO THESES O F THE STUDY
Based on the objectives outlined above, the study will be guided by the
following hypotheses:
a) The neglect of the agricultural sector has no effect on Nigeria 's
economic growth.
b) Dw indling agricultural productivity doe s no t affect Nigeria's
econom ic growth.
1.6: POLICY RELEVANCE
The significance of this study is rooted in the fact that:a) Policy-makers will be sensitized on the need to accord agriculture, its
rightfbl place in the scheme of things.
b) It will beef up the existing pool of know ledge on the role of agricu lture in
economic growth.
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c) Researchers will be better equipped to grappled with problems associated
with agriculture and economic growth.
d) The findings would go a long way in providing vital information that will
guide government functionaries and policy-makers in formulating effective
macro-economic polices which can provide the leeway to economic
growth.
1 .7 : SCOPE O F THE STUDY
The country-specific study covers the period1970 to 2005. The choice of
the period is informed by availability of data. The data will be gleaned from the
bulletin of the Central Bank of Nigeria.
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CHAPTER TWO
2.0: LITERATURE REVIEW
This chapter reviews some relevant literature and is organized under the
following subheadings:
2.1 Theoretical framework2.2 Theoretical literature
2.2.1 Agriculture and economic growth
2.2.2 Agriculture and poverty reduction
2.2.3 A griculture, GDP, employment
generation and rural-urban drift.
2.2.4 The agricultural sector and growth
of the Nigerian economy
2.2.5 Summary of theoretica l literature
2.3 Empirical literature
2.3.1 Summary of empirical literature
2.4 Summary of literature reviewlgrand summary
'2.5 Limitations/motivation for further studies
2.1: THEORETICAL FRAMEWORK
Rostow 's stages of economic growth.
In his historical approach to the process of economic growth, professor
, W.W. Rostow, distinguishes five stages of economic growth:
1. The traditional society ;
2. The pre-conditions for take-o ff;
3. The take-off;4. The drive to maturity;and
5. The age of high mass-consumption.
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The take-off:
According to Rostow, the take-off is the 'great w atershed' in the life of a
society "when growth becomes its normal condition. Forces of modernization
contend against the habits and institutions. The value and interest of the traditional
society make a decisive breakthrough; and compound interest gets built into thesociety's structure". By the phrase compound interest, Rostow implies 'that
growth normally proceeds by geometric progression, such as a savings account if
interest is left to compound with principal'. In separate example, Rostow defines
the take-off "as an industrial revolution, tied directly to radical changes in the
methods of production, having their decisive consequence over a relatively short
period of time."
The take-off: period is supposed to be short lasting for about two decades.
Conditions for take-off: the requirements for take-off are the following three
related but necessary conditions:
1. "A rise in the rate of productive investment from, say, 5 percent or less to
over 10 percent of national incom e or net national product;
2. The development of one or more substantial manufacturing sectors with a
high rate of growth;3. The existence of quick emergence of a political, social and institutional
framework which exploits the impulses to expansion of the modern sector
and gives to growth , an outgoing character".
2.2: THEORETICAL LITERATURE:
2.2.1: Agriculture And Economic Growth
Development econom ists in general and agricultural econom ists in particular, havefocused on how agriculture can best contribute to overall economic growth and
modernization. Many early analysts (Fei and Ranis, 1961; Jogenson, 1961 ;
Hirschman, 1958; Scitovsky, 1954; Lewis, 1954; Rosenstein- Rodan, 1943), have
highlighted agriculture because of its abundance of resources and its ability to
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transfer surpluses to the more important industrial sector. The conventional
approach to the roles of agriculture in economic growth concentrated on
agriculture's important market-mediated linkages:
1. Providing labour for an urbanized industrial work force;* *
11. Providing food for expanding populations with higher incomes;i i i . Supplying savings for investment in industry;
iv. Enlarging markets for industrial output;
v. Providing export earnings to pay for imported capital goods; and
vi. Producing primary materials for agro-processing indus tries ('Timer,
2002; Delgado et al, 1994; Ravis et al., 1990; Johnston and Mellor,
196 1).
Rapid agricultural productivity growth is a p re-requisite for the market-mediated
linkages to be mutually beneficial. Productivity growth that resulted from
agricultural R a D has had an enormous impact on food supplies and food prices
and consequent beneficial impacts on food security and poverty reduction (Hazel1
and Haggblade, 1993; Binswanger, 1980; Hayami and Merdt,19 77; I'instrup-
'Anderson, 1976).
Alston et al., 1995, posit that "Because a relatively high proportion o f any incom egain made by the poor is spent on food, the income effects of research-induced
supply shifts, can have major nutritional implications, particularly if those shifts
result from techno logies aimed at the poorest producers".
Agricultural productivity growth also triggers the generation of non-market
mediated linkages between the agricultural sector and the rest of the economy.
These include the indirect contributions of a vibrant agricultural sector to: food
security and poverty alleviations; safety net and buffer role; and the supply of
environmental services (FAO, 2004a). While agriculture's direct private
contributions to farm households are tangible, easy indirect benefits tend to be
over looked in assessing rates of returns. Ignoring the whole range of economic
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and social contributions of agriculture underestimates the returns to investm ent in
the sector (Valdes and Foster, 2005).
Some empirical evidence exist on the positive relationship between agricultural
' growth and economic growth (Valdes and Foster, 2005). The transformation of
agriculture from its traditional subsistence roots induced by technical change, to amodernizing and eventually industrialized agricultural sector, is a phenomenon
observed across the developing world.
Concluding, it is clear that agricultural growth has played a historically important
role in the process of economic development. Evidence from industrialized
countries as well as countries that are rapidly developing today indicate that
agriculture was the engine that contributed to growth in the non-agricultural
sectors and to over-all economic well being. Economic growth originating in
agriculture can have a particularly strong impact in reducing poverty and hunger.
Increasing employment and incomes in agriculture stimulates demand for non-
agricultural goods and services, thereby providing a boost to non-farm rural
incomes as w ell.
2.2.2 Agriculture And Poverty Reduction.
Agriculture's contribution to poverty reduction is sometimes thought to be small,
because its relative economic importance usually falls when low income countries
successfully develop. This view is misleading. Strong agricultural growth,
particularly increased productivity, has been a feature of countries that have
successfully reduced poverty. Evidence consistently shows that agricultural
growth is highly effective in reducing poverty.
Gallup (1997), reports that every1% increase in per capita agricultural outputleads to a 1.61% increase in the incomes of the poorest 20% of the population.
Thirtle (2001), concludes from a major cross- country analysis that, on the
average, every 1% increase in agricultural yield reduces the number of people
living on less than US$1 a day by 0.83%. Smith& Hadda (2002) are of the view
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that rapid increase in agricultural output, brought about by increasing land and
labour productivity, have made food cheaper, benefiting both the urban and rural
poor, who spend much of their income on food. Bangladesh provides an excellent
example. Between 1980 and 2000, the real wholesale price of rice in Dhaka's
markets fell from 20 to 11 in Taka per kg, bringing major benefits to poor
consumers.
Nugent (2000), supports the above view by stating that poor households typically
spend 5 0 4 0 % o f their income on food including many poor farmers.
FAOSTAT (2004), posits that, with the right conditions, increasing agricultural
productivity has increased the incomes of both small and large farmers and
generated employment opportunities. These increases in income are particularly
important because the proportion of people mainly dependent on agriculture for
their income remains high, ranging from 45% in East and south East Asia, to
52.2% in south Asia and 63.5% in Sub Saharan African.
Lele and Aganva l (1989); Lipton and Longhurst (1989), opine that a large body of
evidence shows that higher agricultural productivity in Asia, consistently raised
'farmers' incomes despite declining market prices resulting from increased output.
A survey in the 90s in India concluded that the average real income of small, farmers rose by 90% (Dev. 1998). Haggblade (et-al., 2004), believe that,
Agriculture's historical importance to poverty reduction goes far beyond its impact
on agriculture-based livelihoods. Where agriculture has grown rapidly, higher
rural incom es and cheaper food hav e increased the demand for goods and services
produced outside agriculture.
Th e strong linkages or "multipliers" between growth in agriculture and that in the
wider economy have allowed poor countries to diversifjr their economies to
sectors where growth is generally faster and labour productivity and wages are
higher.
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2.2.3 Agricultnre, G DP, Employment Generation and
Rural-Urban Migration
A DFID policy paper on the role of agriculture on economic growth and poverty
reduction (2005), explains that, agriculture accounts for a significant proportion of
G D P in countries where the agency works. Over time, the "structural
transformation" of poor countries' economies away from dependence on
agriculture lies at the heart of sustained poverty reduction. This relationship is
greatest when countries are least developed. At this early stage of growth,
agriculture typically accounts for a large share of total employment. Also, food
.represents a major part of poor people's spending. As the non-farm sector
develops, and economies become progressively less dependent on agriculture, the
relationship becomes less important eventually, but remains significant in some
parts of these econom ies where the non- farm sector is least developed.
Hazel1 and Ramasamy (1991), reveal that increased agricultural productivity has
also created em ployment opportunities on farms, although this did not necessarily
result in higher wages.
Mellor (2001a), supports the above view through cross-country studies which
estimate that for every 1% increase in agricultural output, farm employment isincreased by between 0.3 and 0.6%.
Kydd et a1 (2004), explains that the development of non-farm opportunities will be
uneven between regions and over time. To es.cape poverty, people may have to
leave their home areas, either for the season or permanently. Some times they may
even return to agriculture if growth in the non-farm sector stalls (for eg, in
Indonesia, during the financial crisis of the 90s). People may also combine
agriculture and non-farm work.
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2.2.4 Th e Agricultural Sector And G rowth Of Th e Nigerian Econom y
Jones and Woolf, 1969; Oluwasanmi, 1966; Eicher and Witt, 1964, believe that
the agricultural sector has the potential to be the industrial and economic
springboard from which a country's development can take off.
Stewarte, 2001, is of the view that more often than not, agricultural activities are
usually concentrated in the less developed rural areas where there is a critical need
for rural transformation, redistribution, poverty alleviation and socio-economic
development.
Humbert, 2001, posits that the agricultural sector has the potential to shape the
landscape, provide environmental benefits such as land conservation, guarantee
the sustainable management of renewable natural resources, preserve biodiversity,
and contribute to the viability of many rural areas. It is undebatable that a
sustained agricultural growth has been highly instrumental to Brazil's rapid rural
transformation, the empowerment of Brazilian peasants and the alleviation of
abject poverty.
Ogen, 2003: Interestingly, the Nigerian economy, like that of Brazil, during the' first decade after independence could reasonably be described as an agricultur~1
economy because agriculture served ,as the engine of growth of the overalleconomy. From the standpoint of occupational distribution and contribution to
GDP, agriculture was the leading sector.
Alkali, 1997, writes that Nigeria in the 60's was the world's second largest
producer of cocoa, largest exporter of palm kernel and largest producer and
exporter of palm oil. The sector contributed over 60 percent of theGDP despite
the reliance of Nigerian peasant farmers on traditional tools.
Lawal, 1997, explains that these farmers produced 70 percen t of Nigeria's exports
and 95 percent of its food needs.
Olagbaju and Falola (1996)' are of the view that the agricultural sector now
accounts for less than5 percen t of Nigeria's GDP.
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2.2.5: Summ ary of Theoretical Literature
A cursory look at the theoretical literature reveals that beyond the supply of food
and fibre, agriculture has provided important market-mediated linkages by
providing labour for an urbanized industrial workforce, enlarging markets for
industrial output and prov iding export earnings to pay for imported capital goods.
I There is also a lot of evidence to buttress the fact that apart from being a major
contributor to the GDP in the sixties the sector has facilitated the growth of the
Nigerian economy by enhancing poverty alleviation, employment and income
generation, as well as a reduction in rural-urban migration.
2.3: EMPIRICAL LITERATURE
Tsigas, M and Ehui, S, in a general equilibrium analysis, applied a general
equilibrium model (G TAL) based on common assumptions as perfect com petition,
constant returns to scale, and no changein the economy-wide employment of
resources. Each regional economy was made up of several economic agents as
follows:' a. On the demand side of the model, a utility-maximizing household
purchases commodities (for private and government use) and it saves partof its income, which consists of returns to primary factors and net tax
collections.
b. On the production side of the model, cost-minimizing producers employ
primary factor services and intermediate inputs to supply commodities.
The analysis was based on data consisting of 19 regions and 31
sectors/comm odities. Nigeria and 12 other economies cover sub-saharan Africa;
other economics are North America, the European Union, Japan, Indonesia, Rest
of Asia and the-rest-of the world (ROW). Twelve sectors cover primary
agriculture; nine sectors cover processed foods; the rest of natural resource
industries, manufac tures, and serv ices are covered with ten sectors .
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They ran series of simulations to assess the impact of productivity improvements
and policy changes on Nigeria's growth. In particular, they simulated:
Sector-specific Hicks-neutral technical change (augmenting the returns to
all productive factors equally);
Factor-biased technological change (e.g. land-specific productivity
improvem ents vs capital-specific productivity improvements);
Improvem ents in domestic and foreign trade transportation; and
Trade liberalization by Nigeria
Their findings were as follows:
a. A percentage technological progress in the oil sector gives large we lfare
benefits in dollar terms,$142.72million. No other sector in Nigeria gives
larger welfare gains.
b. When compared to Indonesia, Zimbabwe and Uganda, comparable
investments would yield higher returns in some agricultural sectors than in
oil.
c. Technological improvements related to unskilled labor produce, by far, the
highest returns in Agriculture: cattle, other livestock, fruits and vegetables
have the highest returns. In manufacture, the highest returns are obtainedfrom technological improvements related to capital.
d. International transportation improvements lower the cost of both Nigerian
exports and imports.
2.3.1: Summary of Empirical Literature
The study revealeda lot of interest in m odernizing Nigerian agriculture. However,
it went on to underscore the insufficiency of knowledge about the growth potential
of agriculture. In the course of applying general equilibrium model to estimate
growth potential of agriculture in N igeria, Tsigas et.al found that a few agricultural
sectors may outperform several m anufacturing sectors.
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It needs be noted, that while pervious studies on the role of Agriculture in
Nigeria's economic growth used Cobb Douglas production function, this study
will use simple multiple regression model to capture its objectives.
2.4: S U M M A RY OF LITERATURE REVIEWIGRAND SUM MARY
' Sustained growth in an economy requires the continuous improvement in total
factor productivity (TFP) and this requires public expenditures for infrastructure
and human capital developments. At the very early stages, the economy needs an
..engine of growth.
While in the now developed countries, it appears that the major stimulus to early
growth was industrial innovations accompanied but not led by agricultural
innovations, there have been som e developing countries in the recent past, notably
India, China and Taiwan, where growth was led by agricultural broad-based
productivity changes. In these countries, it seems that the major source of the
demand for the increased product o f the agricultural sector was domestic,as there'were substantial levels of initial poverty. Hence, improved agricultural incomes
directly led to increases in the domestic demand for the larger quantitiesof foodproduced domestically.
The situation may well be different in many of the developing countries, such as
those in many parts of Africa, in the sense that the cost per beneficiary of
agricultural productivity improvement may be high because of low farm
population densities. This not withstanding, the bulk of evidence lends credence to
the fact that agriculture had constituted the much-needed springboard to the
growth and eventual development of many economies.
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2.5: LIMITATIONS1 MOTIVATION FOR FURTHER ST UDIES
The bulk of literature reviewed, indicate that the views and empirical findings of
different economists vary overtime. For a more acceptable and consensus result,
more studies need to be conducted in countries with different economic
cliinates/conditions. Against this backdrop, there is the need to carry out further
studies in Africa and other less developed countries.
Different case studies and different methodologies tend to produce different
results. Also, most of the studies use cross-section data on countries that may be
diverse, raising the possibility that the empirical findings could be distorted by
heterogeneity biases affecting both agricultural growth rate and the over-all
, economic growth.
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CHAPTER THREE
3.0: METHODOLOGY
3.1: THE MODEL
This study we shall employ the multiple regression model.The goal of multiple regression is to produce a model in the form of a linear
equation that identifies the best combination of independent variables like FST,
ROPS, LVST, FISHN on GDP and also OEXP, CPT, LBA, ACGSF, PFP and
PEX on the ASG DP to optionally predict the criterion variables. Its compu tational
.,procedure confo rms to the ordinary least squares solution; the so lution or model
describes a line for which the sum of the squared differences before the predicted
and actual values of the criterion variable is minimal. Akintola (2002) used OLS
multiple regression to analyze the relationship between the specific explanatory
variables and the value of food imports. Ademola and Falusi (2003) improved on
Akintola (2000) and also took a consideration on foreign exchange constraint in
estimating their food import demand for rice in Nigeria as canvassed by the
proponent of the import exchange
3.2:MODEL SPECIFICATIONS
Economic theory on factors militating against the robustness of agricultural
production in Nigeria lists certain factors. The most prominent among them will
be used in the analysis and these are specified as follows:
Functional specification
1 . GDP = f (FST, CROPS, LVST, FISH N) . l a )2. ASGDP = f (OEXP, CPI, LBA, ACGSF, PFP, PEX).. (2a)
Econom etric model specification
1 . GDP = Bo+ BIFS T +B2CROP+ B3LVST+ B4FlSHN+pi. .(lb)
2. ASGDP =ao + a20CEXP+ a2CPI + a3BUDT+ a4ACGSF+ PFP + PEX + Vi
. (2b)
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Where:
GDP = Gross D omestic Product- dependent variab le (1)
FST = Fishery
CROP = CRO P production
LVST = Livestock Production
FISHN = Fishery Production
Bo = Constant term (1)
B 1, . Bq = Population Parameterspi = Error term (l b )
.. nd!
ASGDP=
Agriculture Sector GDPOEXP = Oil Exploration
CPI = Consum er Price Index as proxy for poverty
ABUT = Agricultural Budget A llocation
ACGST = Agricultural Credit Guarantee Scheme Fund as a proxy for Poor Credit
Scheme.
PFP = Dummy V ariable for Poor Farm Practices
PEXC = Political Exigencies- Dummy Variable.
Vi = Error term (2b)3.3: ESTIMATION PROCEDURE
3.3.1: Method of Data Analysis
As said earlier, the ordinary least square (OLS) method of estimation shall
be employed in this study. This is because of the various assumptions of the
classical least square estimation criteria, which takes care of certain qualities of
the variables. The OLS has Best Linear Unbiased estimator (BLUE). Therefore,
the BLU E are efficient, consistent, sufficient and unbiased estimators.
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Techniques for Evaluation
3.3.2: Evaluation Based on E conometric Criteria
Economic theory explains the nature of the variables in use and their relationship
with one another especially the explained variable and the explanatory variables.
The evaluation therefore is based on whether the coefficients conform to economic
postulations.
I 3.3.3: Evaluation Based on Statistical Criteria (First-order-Test).
i. The test of Goodness of fit ( R ~ )
Coefficient of determination, R2 fits the regression time. It checks the
goodness of fit of a model. TheR~ is important since the closer the observations,
the better the explanation of the variations of the dependent variable.
ii. The Adjusted R~ (R2)
Though R2 measures the goodness of fit, studies have shown that it is only
necessary but not a sufficient condition for measuring the goodness of fit.
. R~ is therefore considered which is a better measure taking into account the
cognizance of the degree of freedom.iii. T-Test & F- Test.
I The t-test will be employed to verifjr whether the variables are individually
statistical significant or not. The F- test shall be used to check the significance of
the entire model.
3.3.4: E valuation based on Econometric Criteria (Second-Order Test).
i. Norm ality Test:
Normality test is used to determine whether or not the residuals conform to the
classical assumptions the stochastic disturbance term is normally distributed with
zero mean and constant variance i.e.
P W O , 8 3
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where: p = stochas tic disturbance term or white noise.
N = Normal distribution
0 = Zero mean
ti2 = Constant V ariance
Jarque-Bera (JB) test shall also be employed to compute the skewness and
Kurtosis.
ii. Co-integ ration Test:
This test is employed to investigate the long run relationships among variab les in
I the model.
'. iii. Stationary first
The data shall be tested to check for the existence of a long term or equilibrium
relationship among the variables.
iv. Auto-correlation Test:
This shall be tested using the Durbin Watson statistics to check the presence of
aufor corre lation in the model.
v. Multicolinearity Test:
This shall be done under the pair wise correlation matrix. It shall be conducted
on the variables to investigate the level of correlation between any two of thevariables when other variables are held constant.
vi. Heteroscedasticity Test:
This will be used to ascertain whether the error term(U,) in the regression model
has a constant variance.
3.4: JUSTIFICATION
The primary advantage of using the standard model is that it presents a complete
picture of the regression outcome to researchers. If the variables were important
enough to earn a place in the design of the study, then they are given room in the
model even if they are not contributing very much to the coefficient of
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determination. That is, on the assumption that the variables were selected on the
basis of their relevance to theory or attests on the basis of hypothesis based on a
comprehensive review of the existing literature on the topic; the standard model
, provides an opportunity to see how they fore as a set in predicting the dependent
variable.
3.5: ANALYTICAL TECHN IQUES FOR EVALUATION O F RESULTS.
The model will be evaluated using OLS method. The sample consists of time
series 1970 to 2005. The work will rely on PC -Give econometric s o h a r e version
..8.0 for estimation.
3.6: DATA AND SOUR CES
The data were obtained from Central Bank of Nigeria (CBN) Statistical Bulletin,
(Various issues), CBN Annual Report,as well as National Bureau o f Statistics. All
series are annual and span the period from 1970 to 2005.
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REFERENCES
BOOKS
Alkali, R.A. ( 1997 ). The World Bank and Nigeria.: Cornucopia or Pandora Box?
Kaduna: Baraka press.
Akinbobola, A (20 01). Globalization and its impact on Emergent states: A11
Analysis of its problems and prospects in Brazil and Nigeria. Lagos:
concept publications.
Arellano, M. (2003).Panel Data Econometrics. New York: Cambridge [Jniversity
Press.
Barro, R.J, and Sala-i- Martin,X.(1995). Economic Growth.New York: McGraw-
Hill.
Bardhan, P.K, and Udry, C. ( 1999).Development Microeconomics. Oxford:
Oxford University Press
Bell, C., P. Hazel1 and R. Slade (1982) . Project Evaluation in regional
prospective. Baltimore: John Hoplcins University Press.
Block, S and P. Timmer (1994) . Agriculture and Economic Growth: Conceptual
Issues and the Kenyan Experience. Cambridge, M A : Harvard Institute for
Internationa l Development.Brown, I, and H. Kane (1994). Full House: Reassessing the Earths population
carrying capacity. New York: The World watch Environmental Alert
series.
Bryceson, D. (1999 b) "sub-saharan Afiica Betwixt and Between". Workingpaper.
Metterlands: University of Leiden
Bunch, R (20 02 ) "Changing productivity through agroecological approaches in
central America ". Earths can London: Agroecological Innovations.
Chenery, H. & Sarquin (1975) . Patterns of Development. 1950-1970. London:
Oxford U niversity Press.
Chronic poverty research center (20 04). The chronic poverty report 2004-05.
Manchester: University of ~ a n c h e s te r
8/8/2019 Alkali Ref
24/27
FAO, 1998. The state offood and Agriculture 1998: Rural non-farm income in
developing countries, ood and Agriculture Organization Italy, Rome.
Jhingan, M.L (2005). The Economics of Development and Planning Delhi:
VRINDA PUB LICARlONS (P) LTD.
Lewis, W.A (1955). The theory of Econom ic growth. London: Allen and Unwin.
JOURNALS:
Adelman, I. (1 984), "Beyond Export-Led Grow ics vol. 41 pp. 19-43.
Antle, J . (1983), "Infrastructure and Aggregate Agricultural Productivity:
International Evidence", Economic Development and Cultural Change vol.
3 1, pp. 609-6 19.Aquaye, K.A, Alston, J.& Pardey, B (2003). "Post-war Productivity Patterns in
U.S. agriculture: Influences of Aggregation procedures in a state-level
Analysis". American Journal of Agricultural Economics 85 (I) L 59-80
Binswanger, H., Yang, M.C., Bowers, A. & Mundlak , Y. (1987), "On the
determinants of cross-country Aggregate Agricultural Supply",Journal of
Econometrics vol. 36: 11 131.
Birdsall, N., & Londono, J.L. (1997), "Asset Inequality Matters: An Assessment
of the World Bank's Approach to poverty Redction",American Economic
Review vol. 87 (2), pp. 32-37.
Binswanger, H.B., Deninger, K.& Teder, G., (1993). Agricultural Land relations
in the developing world.American Journal of Agricultural Economics 75,
1242-8.
Binswanger, H.B., (1980). Income distribution effects of technical change: Some
analytical issues.South East Asian Economic Review 1, 179-2 18
Bond, M.E (1983), "Agricultural Responses to prices in Sub-'Saharan Africa",
International Monetary Fund St afpa pe rs vol. 30 (4), pp. 70326.
Bourguignon, F. & Morison, C. (1998), "Inequality and Development: The Role of
Dualism", Journal ofD evelopm ent Economics vol. 57(2), pp 233-257.
8/8/2019 Alkali Ref
25/27
Deininger, K. (2003). Land Policies for growth and poverty Reduction.
Washington DC: W orld Bank publication.
Delgado, C., Hopkins andV. Kelly (1998) "Agricultural growth Linkages in Sub-
saharan Africa". IFPRI Research Report 107. Washington DC:
International Food policy R esearch Institute.
Mahendra, D (1998) "Regional Disparities in Agricultural Labour Productivity
and Rural poverty". Indian Economic Review, 23 (2): 167-205.
DFID (2002). Better livelihoods for poor people: the role of Agriculture. London:
DFID.
I Eicher, C, & Witt, L, (eds) (1964)Agriculture and Economic Development. New
York: McGraw.Eastwood, R., Hill, Lipton, M.& Newell, A., (2005). Farm size.
Olagunju, M.A "Economic Issues in Nigeria's Development" in Akinbi, J . 0 (ed)
(2000). Towards a better Nigeria. Ibadan: Ben Q uality Press.
Oluwasanmi, H.A (1966) Agriculture and Nigeria's Economic Development
Ibadan: Ibadan: 1badan University Press.
Eastwood, R., Lipton,M. and Newell, A,, (2005). Farm size. In: Everson, R, and
Pingali, P.L. (Eds), Handbook of Agricultural Economics Amsterdam:
North Holland Press.
Hirchmann, A.O., (195 8). The Strategy of Economic Development in Developing
Countries, Connecticut: Yale University Press.- 1
Ogen, 0 (2003) "Patterns of Economic Growth and Development in Nigeria since
1960". Arifalo, S.0 and Gboyega, A (eds) (2003).Essays in Nigerian
Contemporary History. Lagos: Fikst Academic Publishers.
Ogundipe, K.A. (1998).Fundamentals ofDevelopment Economics. Lagos: Percept
Books.
FAO, 2004b. The State of agricultural commodity markets food and agriculture
organization,- Rome, Italy. FAO, 2002. World Agriculture: towards
20 1X?O3O, FAO, Rome.
8/8/2019 Alkali Ref
26/27
DFID (2004a) Agriculture, Growth and Poverty Reduction. Agriculture and
Poverty Reduction Working Paper I. London: DFID.
DFID (20 04~ ).Making R ural Finance Coun t for the poor. Agriculture and Poverty
Reduction Working paper London: DFID.
DFID (2004k) "Agricultural sustainability". Agriculture and poverty reduction
working paper 12. London: DFID.
DFID (2004n). Labour standards and poverty reduction. London: DFID.
F A 0 (2004a) Socio- economic analysis and policy implications of the roles of1
agriculture in developing countries, research programme summary report.
Roles of Agriculture project,-FAO,Rome, Italy.
ENCYCLOPEDIA
Brown, L (et.al) (eds) (2000).The World Book Encyclopedia of People andplaces
Vol., Chicago : World Book Inc.
RESEARCH PAPERS
Bruno, M., Ravillion, M ., & Squire, L. (1996), "Equity and Growth in Develop ingcountries: old and New Perspectives on policy Issues",World Bank policy
Research Working paper, 1963.
Binswanger, H., and Von Braun, J. (1993), "Technological Change and
commercialization in Agriculture", in M.Lipton, and J. van der Gaag
(editors),Including the poor, Washington D.C, The World Bank.
De Janvry, A., 1984 Search ing for styles of development:Lessons porn latin
America and implications for India, Working paper No 357. California:
University of C alifornia, Berkeley.
De Janvry, A., Graff, G. Saloulet,E; & Zilberman, D. (2000)."Technological
change in Agriculture and poverty reduction ", background paper prepared
for the World Bank WDR 2000.
8/8/2019 Alkali Ref
27/27
DFID (2004a) Agriculture, Growth and Poverty Reduction. Agriculture and
Poverty Reduction W orking Paper I. London: DFID.
DFID (20 04~ ) .Making Rural F inance Count for the poor. Agriculture and Poverty
Reduction Working paper London: DFID.DFID (2004k) "Agricultural sustainability". Agriculture and poverty reduction
working paper 12. London: DFID.
DFID (2004n). Labour standards and poverty reduction. London: DFID.I F A 0 (2004a) Socio- economic analysis and policy implications of the roles of
agriculture in developing countries, research programme summary report.
Roles of Agriculture project,-FAO, Rome, Italy.
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