Download presentation

Presentation is loading. Please wait.

Published byAnais Algood Modified over 2 years ago

1
Gary D. Thompson Almuhanad Melhim The University of Arizona Gary D. Thompson Almuhanad Melhim The University of Arizona Estimating Import Demand for Fresh Citrus Linda Calvin Economic Research Service Linda Calvin Economic Research Service

2
Why Study Import Demand? Quantify Impacts of SPS Measures: Elasticities (Own- & Cross-Price) Flexibility Estimates Estimate Welfare of Impacts SPS Quantify Impacts of SPS Measures: Elasticities (Own- & Cross-Price) Flexibility Estimates Estimate Welfare of Impacts SPS

3
Characteristics of SPS Measures Clementines from Spain Country- & Even Region-Specific Date-Specific Aggregated Data Not Appropriate Aggregated Data Not Appropriate Clementines from Spain Country- & Even Region-Specific Date-Specific Aggregated Data Not Appropriate Aggregated Data Not Appropriate

4
SpainSpain S. Africa AustraliaAustralia MoroccoMorocco U.S. Mandarin Imports, 2000-03 Source: FATUS

5
Supply Side Drives Availability Clementines from Spain Zero Import Quantity No Import Price Unobservable, Not Unobserved Not Censoring; Partial Truncation: Missing Price & Quantity Micro-Data Censoring Models Not Appropriate Clementines from Spain Zero Import Quantity No Import Price Unobservable, Not Unobserved Not Censoring; Partial Truncation: Missing Price & Quantity Micro-Data Censoring Models Not Appropriate

6
Possible Approaches to Truncation Incidental Truncation Sample selection is typically cross- sectional. Sample selection of import availability depends on agro-climatic factors (e.g. weather throughout the year) Incidental Truncation Sample selection is typically cross- sectional. Sample selection of import availability depends on agro-climatic factors (e.g. weather throughout the year)

7
Truncation & Demand Systems Multiple selectivity equations + Demand system equations Cross-Sectional - Sequential Selectivity Models (Lahiri & Song) Multiple selectivity equations + Demand system equations Cross-Sectional - Sequential Selectivity Models (Lahiri & Song)

8
MandarinsMandarins OrangesOranges TangerinesTangerines Partial Truncation at Product Level

9
Selectivity Equations: Probit/Logit Binary Regression: Dep. Vbl. = 0 if no imports = 1 if positive imports = 1 if positive imports Exp. Vbls.: Temperature; Precipitation in Production Region in Production Region Binary Regression: Dep. Vbl. = 0 if no imports = 1 if positive imports = 1 if positive imports Exp. Vbls.: Temperature; Precipitation in Production Region in Production Region

10
Marshallian Demand Equations Incomplete Demand System LINQUAD: Weak integrability guarantees reliable elasticity and welfare measures. Incomplete Demand System LINQUAD: Weak integrability guarantees reliable elasticity and welfare measures.

11
Demand Equations + Truncation Introduce Correction for Partial Truncation as Demographic Shifter in LINQUAD: Not just inverse Mills ratio Multivariate normal is maintained Multivariate normal is maintained Introduce Correction for Partial Truncation as Demographic Shifter in LINQUAD: Not just inverse Mills ratio Multivariate normal is maintained Multivariate normal is maintained

12
Choice of Samples for Estimation 1. Consecutive Months Each Year Oct. - Feb. Season; 1992-93 to 2002-03 2.Aggregate Temporally to Eliminate Zero Quantities & Missing Prices Quantities & Missing Prices Semi-annual; 1989 - 2003 1. Consecutive Months Each Year Oct. - Feb. Season; 1992-93 to 2002-03 2.Aggregate Temporally to Eliminate Zero Quantities & Missing Prices Quantities & Missing Prices Semi-annual; 1989 - 2003

13
Uncompensated Elasticities, Sample Median TangerineMandarinOrange Tangerine -0.026-4.0160.463 Mandarin -0.006-4.3750.039 Orange0.374-0.670-2.268 Sample: Monthly, Oct.-Feb., 1992 – 2003 (T = 55) TangerineMandarinOrange Tangerine -0.026-4.0160.463 Mandarin -0.006-4.3750.039 Orange0.374-0.670-2.268 Sample: Monthly, Oct.-Feb., 1992 – 2003 (T = 55)

14
Uncompensated Elasticities, Sample Median TangerineMandarinOrange Tangerine -2.1930.543-0.134 Mandarin 0.020-0.326-0.463 Orange0.133-0.498-0.101 Sample: Semi-annual, 1989 – 2003 (T = 30) TangerineMandarinOrange Tangerine -2.1930.543-0.134 Mandarin 0.020-0.326-0.463 Orange0.133-0.498-0.101 Sample: Semi-annual, 1989 – 2003 (T = 30)

15
Oct99Oct99 Own-Price Elasticity, Mandarins Oct00Oct00 Oct01Oct01 Oct02Oct02 Suspension of Spanish Imports

16
Cross-Price Elasticity, Mand.-Orange Oct99Oct99 Oct00Oct00 Oct01Oct01Oct02Oct02 Suspension of Spanish Imports

17
Correction for Truncation 1.Necessary for modeling seasonal availability of imports (or exports). 2.Yields reasonable, if highly variable, elasticity estimates. 3.Uses data readily available, e.g. FATUS, NOAA. 1.Necessary for modeling seasonal availability of imports (or exports). 2.Yields reasonable, if highly variable, elasticity estimates. 3.Uses data readily available, e.g. FATUS, NOAA.

18
Future Work Demand for Domestic & Imported Fresh Citrus Apply to other specialty crops, e.g. asparagus, fresh tomatoes. MLE or Non-Parametric Estimation Demand for Domestic & Imported Fresh Citrus Apply to other specialty crops, e.g. asparagus, fresh tomatoes. MLE or Non-Parametric Estimation

Similar presentations

OK

Climate Change Adaptation: Crop Choice. Crop Choice As climate changes, net revenues of plants change – Crops move along their climate response function.

Climate Change Adaptation: Crop Choice. Crop Choice As climate changes, net revenues of plants change – Crops move along their climate response function.

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on condition based maintenance dod Ppt on ready to serve beverages direct Ppt on art and craft movement artists Microsoft office ppt online ticket Ppt on sixth sense technology pdf Ppt on 2nd world war american Ppt on design patterns in java Ppt on viruses and anti viruses names Topics for ppt on environmental education Ppt on mechanical power transmission