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DO DECREASING HAZARD FUNCTIONS FOR PRICE CHANGES MAKE ANY SENSE?
Documentos de Trabajo N.º 0508
Luis J. Álvarez, Pablo Burrieland Ignacio Hernando
2005
DO DECREASING HAZARD FUNCTIONS FOR PRICE CHANGES MAKE ANY SENSE?
DO DECREASING HAZARD FUNCTIONS FOR PRICE CHANGES
MAKE ANY SENSE? (*)
Luis J. Álvarez, Pablo Burriel and Ignacio Hernando
BANCO DE ESPAÑA
(*) This study was conducted in the context of the Eurosystem Inflation Persistence Network. We are extremely gratefulto the Instituto Nacional de Estadística for providing us with the micro price data and, particularly, to Aránzazu García-Almuzara, Manuel Garrido, Ignacio González-Veiga and Alberta Ruiz del Campo for their help. In addition, we wish to thank all the other network members for discussions and suggestions, in particular Stephen Cecchetti, Daniel Dias, JordiGalí, Vitor Gaspar, Hervé Le Bihan, Pedro Neves, Patrick Sevestre, Frank Smets, Harald Stahl and Philip Vermeulen. Weare most grateful to Josef Baumgartner, Emmanuel Dhyne, Pete Klenow, Hervé Le Bihan and Giovanni Veronese forproviding us with data on the hazard function of their respective countries, and to Alex Wolman for providing the codes used in Dotsey, King and Wolman (1999).
Documentos de Trabajo. N.º 0508
2005
The Working Paper Series seeks to disseminate original research in economics and finance. All papers have been anonymously refereed. By publishing these papers, the Banco de España aims to contribute to economic analysis and, in particular, to knowledge of the Spanish economy and its international environment. The opinions and analyses in the Working Paper Series are the responsibility of the authors and, therefore, do not necessarily coincide with those of the Banco de España or the Eurosystem. The Banco de España disseminates its main reports and most of its publications via the INTERNET at the following website: http://www.bde.es. Reproduction for educational and non-commercial purposes is permitted provided that the source is acknowledged. © BANCO DE ESPAÑA, Madrid, 2005 ISSN: 0213-2710 (print) ISSN: 1579-8666 (on line) Depósito legal: Imprenta del Banco de España
Abstract
A common finding in empirical studies using micro data on consumer and producer prices is
that hazard functions for price changes are decreasing. This means that a firm will have a
lower probability of changing its price the longer it has kept it unchanged. This result is at
odds with standard models of price setting. In this note a simple explanation is proposed:
decreasing hazards may result from aggregating heterogeneous price setters. We show
analytically the form of this heterogeneity effect for the most commonly used pricing rules and
find that the aggregate hazard is (nearly always) decreasing. Results are illustrated using
Spanish producer and consumer price data. We find that a very accurate representation of
individual data is obtained by considering just 4 groups of agents: one group of flexible Calvo
agents, one group of intermediate Calvo agents and one group of sticky Calvo agents plus an
annual Calvo process.
Key words: hazard function, price setting models, heterogeneous agents, mixture models.
JEL Codes: C40, D40, E30.
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Figure 1: International evidence on decreasing hazard functions for price changes
AUSTRIA - CPI BELGIUM - CPI
SPAIN - CPI US - CPI
ITALY - CPIFRANCE - CPI
SPAIN - PPI
0%
10%
20%
30%
40%
50%
60%
0 12 24 36months since the last price change
Prob
abili
ty o
f a p
rice
chan
ge
0%
10%
20%
30%
40%
50%
60%
0 12 24 36months since the last price change
Prob
abili
ty o
f a p
rice
chan
ge
0%
10%
20%
30%
40%
50%
60%
0 12 24 36months since the last price change
Prob
abili
ty o
f a p
rice
chan
ge
0%
10%
20%
30%
40%
50%
60%
0 12 24 36months since the last price change
Prob
abili
ty o
f a p
rice
chan
ge
0%
10%
20%
30%
40%
50%
60%
0 12 24 36months since the last price change
Prob
abili
ty o
f a p
rice
chan
ge0%
10%
20%
30%
40%
50%
60%
0 12 24 36months since the last price change
Prob
abili
ty o
f a p
rice
chan
ge
0%
10%
20%
30%
40%
50%
60%
0 12 24 36months since the last price change
Prob
abili
ty o
f a p
rice
chan
ge
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Figure 2. Hazard of 2 groups with Calvo price setting and average price duration of 3 and 12 months,respectively
Hazard of 2 Calvo modelswith different
average durations
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
duration months 3duration in months 12
Population Hazard rate,50% of firms with Calvo average duration of 12 months50% of firms with Calvo average duration of 3 months
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
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Figure 3. Hazard of 1 Calvo and 1 Taylor
Population Hazard rate,91.7% of firms with Calvo average duration of 12 months
5.5% of firms with Taylor contracts of 12 months3% of firms with Taylor contracts of 24 months
0.00
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09
0.10
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29
Hazard of 1 Calvo and1 Taylor model
0.05
0.06
0.07
0.08
0.09
0.10
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Taylor 12 monthsCalvo 12 months
1
Population Hazard rate,94% of firms with Calvo average duration of 12 months
6% of firms with Taylor contracts of 12 months
0.05
0.06
0.07
0.08
0.09
0.10
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
0,211
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Figure 4. Hazard of 1 Calvo and 1 Annual Calvo
Calvo and annual Calvo
0
0.2
0.4
0.6
0.8
1
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35
Months since the last price change
Calvo Seasonal Calvo Aggregation of Calvo and annual Calvo
0
0.2
0.4
0.6
0.8
1
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35
Months since the last price change
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Figure 5. Hazard of 1 Calvo and 1 DKW model
Aggregation of Calvo and DKW
0
0.2
0.4
0.6
0.8
1
3 12 21 30 39 48 57 66 75
Months since the last price change
Individual hazard rates
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
3 12 21 30 39 48 57 66 75
Months since the last price change
Calvo INF=0, average duration 1 year
DKW INF=1, Markup=30
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Figure 6. Hazard of two different DKW models
Aggregation of DKW
0
0.2
0.4
0.6
0.8
1
3 9 15 21 27 33 39 45 51 57 63 69 75 81
Months since the last price change
INF=1% and 5%,
Mark-up:30%DKW hazard rates
0
0.2
0.4
0.6
0.8
1
3 9 15 21 27 33 39 45 51 57 63 69 75 81
Months since the last price change
DKW INF=1, Markup=30 DKW INF=5, Markup=30
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number ofmodels
AIC BIC AIC BIC AIC BIC AIC BIC
1 144469 144476 1203134 1203144 130709 130711 1153457 1153460
2 133104 133116 914830 914847 123544 123552 906843 906853
3 121257 121274 897292 897316 122468 122480 902244 902261
4 125501 125523 902373 902404 124889 124906 920091 920115
5 122716 122743 901480 901518 123852 123874 907579 907609
firms spells
standard Calvo
Producer prices
standard + 1 annual Calvo
Table 1. Producer Prices: selection of the number of differentCalvo agents
firms spells
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Price setting models
WeightCalvo
ParameterMean
duration WeightCalvo
ParameterMean
duration WeightCalvo
ParameterMean
duration WeightCalvo
ParameterMean
duration
Flexible Calvo 16.5% 0.11 1.1 56.9% 0.11 1.1 15.4% 0.08 1.1 56.7% 0.11 1.1(0,38%) (0,01) (0,02) (0,14%) (0,00) (0,00) (0,37%) (0,01) (0,01) (0,14%) (0,00) (0,00)
Intermediate Calvo 48.2% 0.92 12.3 32.3% 0.89 9.2 60.8% 0.93 13.8 37.8% 0.90 10.5(1,60%) (0,00) (0,48) (0,28%) (0,00) (0,11) (1,77%) (0,00) (0,47) (0,31%) (0,00) (0,11)
9.2 6.9Sticky Calvo 26.9% 0.99 91.4 6.8% 0.98 50.1 23.8% 0.99 105.9 5.5% 0.98 56.0
(1,68%) (0,00) (8,86) (0,29%) (0,00) (2,12) (1,87%) (0,00) (13,82) (0,33%) (0,00) (3,28)
Annual Calvo 8.5% 0.28 16.8 4.0% 0.21 15.2(0,27%) (0,02) (0,03) (0,06%) (0,01) (0,01)
Log likelihood -60621 -448639 -61229 -451117Number of observations 26965 244864 26965 244864Joint significance Wald test 20.15 2479.23 68.98 2553.07p- value 0.00 0.00 0.00 0.00
Table 2. Producer Prices: estimation of price setting models
standard + 1 annual Calvo standard Calvospellsfirms firms spells
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Figure 7. Producer Prices: Hazard and contribution to hazard
00.0
5.0
5.1.1
.15
.15
.2.2
00 1212 2424 3636 4848m o nths s ince las t p r ice chang em o nths s ince las t p r ice chang e
fit ted h aza rdf it ted h aza rd em p ir ica l h az ardem p ir ica l h az ard
3 C alvo & C alvo an nu a l3 C alvo & C alvo an nu a lP P I haza rd by firmP PI haza rd by firm
0.2
.4.6
0 1 2 2 4 3 6 4 8m o n th s s in c e la s t p r ic e c h a n g e
fitte d h a z a rd em p ir ica l h aza rd
3 C a lv o & C a lv o a n n u a lP P I h a za rd
0.2
.4.6
1 2 3 4 5 6 7 8 9 101112131415161718192021222324252627282930313233343536373839404142434445464748
3 Calvo & 1 annual CalvoContributions to the PPI hazard rate
flexible Calvo intermediate Calvosticky Calvo annual Calvo
0.0
5.1
.15
.2
1 2 3 4 5 6 7 8 9 101112131415161718192021222324252627282930313233343536373839404142434445464748
3 Calvo & 1 annual CalvoContributions to the PPI hazard rate by firm
flexible Calvo intermediate Calvosticky Calvo annual Calvo
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non-durablesfood
non-durablesnon- food durables intermediate energy capital All groups
Price setting ModelFlexible Calvo 3.5% 1.3% 1.0% 8.8% 6.1% 1.3% 21.9%Intermediate Calvo 8.6% 7.0% 7.2% 17.6% 4.2% 5.9% 50.5%Sticky Calvo 3.0% 3.1% 3.7% 7.2% 0.4% 3.5% 20.9%Annual Calvo 1.0% 1.1% 1.1% 2.0% 0.3% 1.2% 6.8%
Share of PPI 16.1% 12.4% 13.1% 35.5% 11.1% 11.8% 100.0%
Table 3. Price setting models by PPI main industrial groupings (using PPI weights)
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number ofmodels
AIC BIC AIC BIC AIC BIC AIC BIC
1 75704 75711 894119 894129 73253 73255 891611 891614
2 76654 76664 787640 787656 68925 68931 789456 789465
3 67275 67290 778891 778914 68132 68142 781875 781891
4 67810 67829 781125 781154 68177 68192 786004 786026
5 67825 67848 779982 780017 68203 68222 791049 791078
firms
Table 4. Consumer Prices: selection of the number of differentCalvo agents
Consumer prices
spells
standard + 1 annual Calvo standard Calvo
firmsspells
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Price setting models
WeightCalvo
ParameterMean
duration WeightCalvo
ParameterMean
duration WeightCalvo
ParameterMean
duration WeightCalvo
ParameterMean
duration
Flexible Calvo 22.1% 0.20 1.3 47.5% 0.24 1.3 21.6% 0.19 1.2 48.3% 0.24 1.3(0,62%) (0,02) (0,03) (0,28%) (0,00) (0,01) (0,68%) (0,02) (0,03) (0,26%) (0,00) (0,00)
Intermediate Calvo 50.4% 0.90 10.3 39.5% 0.84 6.4 59.9% 0.92 11.8 41.9% 0.86 7.3(1,44%) (0,00) (0,41) (0,31%) (0,00) (0,08) (1,64%) (0,00) (0,43) (0,35%) (0,00) (0,09)
Sticky Calvo 20.1% 0.98 58.4 9.8% 0.96 27.9 18.5% 0.98 62.6 9.7% 0.96 28.2(1,52%) (0,00) (4,12) (0,30%) (0,00) (0,56) (1,75%) (0,00) (5,45) (0,37%) (0,00) (0,64)
Annual Calvo 7.4% 0.42 20.5 3.2% 0.30 17.2(0,34%) (0,02) (0,06) (0,06%) (0,01) (0,02)
Log likelihood -33630 -389439 -34061 -390932Number of observations 12494 179673 12494 179673Joint significance Wald test 65.75 2058.42 86.84 2792.25p- value 0.00 0.00 0.00 0.00
Table 5. Consumer Prices: estimation of price setting models
standard + 1 annual Calvo standard Calvospellsfirms firms spells
BANCO DE ESPAÑA 31 DOCUMENTO DE TRABAJO N.º 0508
Figure 8. Consumer Prices: Hazard and contribution to hazard0
.05
.1.1
5.2
1 2 3 4 5 6 7 8 9 101112131415161718192021222324252627282930313233343536373839404142434445464748
3 Calvo & 1 annual CalvoContributions to the PPI hazard rate by firm
flexible Calvo intermediate Calvosticky Calvo annual Calvo
0.1
.2.3
.4
0 1 2 2 4 3 6 4 8m on ths s ince la s t p rice cha ng e
fitted h a zard e m p irica l h aza rd
3 C a lv o & C a lvo a n n u a lC P I h a za rd
0.0
5.1
.15
.2.2
5
0 1 2 2 4 3 6 4 8m onths s ince las t p rice change
fitte d h a zard e m p irica l h aza rd
3 C a lv o & C a lv o a n n u a lC P I h a za rd by firm
0.1
.2.3
.4
1 2 3 4 5 6 7 8 9 101112131415161718192021222324252627282930313233343536373839404142434445464748
3 Calvo & 1 annual CalvoContributions to the CPI hazard rate
flexible Calvo intermediate Calvosticky Calvo annual Calvo
0.0
5.1
.15
.2.2
5
1 2 3 4 5 6 7 8 9 101112131415161718192021222324252627282930313233343536373839404142434445464748
3 Calvo & 1 annual CalvoContributions to the CPI hazard rate by firm
flexible Calvo intermediate Calvosticky Calvo annual Calvo
BANCO DE ESPAÑA 32 DOCUMENTO DE TRABAJO N.º 0508
unprocessedfood
processedfood non energy services all
components
Price setting ModelFlexible Calvo 6.8% 4.4% 1.4% 0.8% 13.4%Intermediate Calvo 5.7% 12.4% 22.0% 16.4% 56.6%Sticky Calvo 0.2% 1.5% 7.2% 9.0% 17.9%Annual Calvo 0.1% 0.5% 4.8% 6.8% 12.1%
Share of CPI 12.8% 18.8% 35.4% 33.0% 100.0%
Table 6. Price setting models by CPI main componentes (using CPI weights)
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Figure A.1. Cases 1 and 2: Hazard of 2 groups with Truncated Calvo price setting
Population Hazard rate,50% Truncated Calvo ave 12 months, J=36 m50% Truncated Calvo ave 3 months, J=36 m
0.00
0.05
0.10
0.15
0.20
0.25
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37
Population Hazard rate,50% Truncated Calvo ave 12 months, J=36 m50% Truncated Calvo ave 3 months, J=12 m
0.00
0.05
0.10
0.15
0.20
0.25
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37
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0507 MÁXIMO CAMACHO AND GABRIEL PÉREZ-QUIRÓS: Jump-and-rest effect of U.S. business cycles.
0508 LUIS J. ÁLVAREZ, PABLO BURRIEL AND IGNACIO HERNANDO: Do decreasing hazard functions for price
changes make any sense?
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