台灣肉類產品的消費分析 : NEP模型之應用

Abstract

本文利用台灣1962-2000年肉類產品之年資料來估計NEP需求模型（Nested PIGLOG），藉以探討台灣魚肉、豬肉、牛肉和雞肉的消費變動情形。實證結果顯示：在自身價格方面，魚肉與豬肉價格彈性為正值，違反需求法則；牛肉與雞肉則為負。在交叉彈性方面，豬肉與牛肉、牛肉與雞肉以及雞肉與牛肉的彈性值為正值，顯示彼此互為替代品，其餘的交叉彈性值皆為負值，彼此互為互補品。在支出彈性方面，魚肉與豬肉彈性值小於一，為必需品，而牛肉與雞肉的彈性值則大於一，為奢侈品。

This study estimates the NEP model by employing the annual meat consumption data from 1962 to 2000. Four meat groups are considered in this study, including fish, pork, beef and poultry. Empirical results show that the own-price elasticities of fish and beef are positive, violating the law of demand; whereas beef and poultry are negative. As to cross-price elasticities, only beef and poultry and beef and pork are substitutes with positive cross-price elasticities; others are compliments. Expenditure elasticities tell us that beef and poultry are more price elastic whereas fish and pork have expenditure elasticities less than unity, indicating necessities.