THE DEMAND FOR AQUACULTURAL PRODUCTS IN TAIWAN-AN INVERSE DEMAND SYSTEM APPROACH

臺灣養殖產品總和需求之研究—逆需求體系之應用

江福松(Fu-Sung Chiang) ； 李仲英(Jong-Ying Lee)

《Journal of Marine Science and Technology》 8卷2期 (2000/12) Pp. 101-107

https://doi.org/10.6119/JMST.200012_8(2).0005

摘要

本研究以國內主要的養殖產品(吳郭魚、虱目魚、其他養殖魚類、蝦類、及貝類)為研究物件，就其供給是相當地缺乏彈性(Inelastic)的特性，應用三類逆需求體系(Inverse Demand System)模型進行實證分析並選擇出最適模型－－Laitinen-Theil模型，以建立國內養殖產品之需求體系，並求算出規模彈性及價格反應彈性。研究結果顯示虱目魚的可供消費量對養殖產品價格的影響較其他養殖產品來得顯著。

並列摘要

This study compared two inverse demand systems, the Rotterdam inverse demand system and the Laitinen-Theil inverse demand system, to analyze the demand relationships among aquacultural products in Taiwan. Results demonstrate that the Laitinen-Theil’s inverse demand system fits the data better than the Rotterdam inverse demand system.The demand relationships among five groups of aquacultural products, tilapia, milkfish, other aquaculture fish, shrimp, and shellfish were examined. Monthly transaction prices from local fish markets and per capita consumption for the period from July 1990through December 1995 for these five groups of aquacultural products were used in this study. Results show that milkfish has the absolute highest own-flexibility of 0.495,which is followed by shrimp, shellfish, tilapia, and other aquacultural fish with their own-flexibilities of-0.480,-0.283,-0.213,and -0.090,respectively.Results also show that a one-percent increase in aggregate quantity of aquacultural products would result in decreases in the normalized prices by 1.57%,1.04%,1.54%,0.79%,and 0.80% for tilapia, milkfish, other aquaculturalfish, shrimp, and shellfish, respectively.

並列關鍵字

Inverse demand system ； Demand for aquacultural products ； Taiwan