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| 題 名 | 臺灣蔬菜需求結構性變動之分析=Analysis of Structural Change of Demand for Taiwan Vegetables |
|---|---|
| 作 者 | 萬鍾汶; 姚志華; | 書刊名 | 農業經濟半年刊 |
| 卷 期 | 58 1995.12[民84.12] |
| 頁 次 | 頁47-71 |
| 分類號 | 431 |
| 關鍵詞 | 臺灣; 蔬菜; 需求; 結構性變動; |
| 語 文 | 中文(Chinese) |
| 英文摘要 | This study aimed at investigating demand characteristics for root, stem, leaf, and fruit vegetables in Taiwan, with particular attention on occurence of demand structural change. A dynamic demand model and the Kalman Filter method were applied in empirical analysis to estimate the price elasticity, substitute elasticity, income elasticity and habit formation of these vegetables for the sample period of 1972-92. In addition, the F-test and CUSUMSQ method were utilized to test structural change of vegetable demand. Empirical results indicated that all four kinds of vegetables are inelastic to own price changes except of root vegetables in 1972-1973, leaf vegetables in 1972-1988, and fruit vegetables in 1972. The four kinds of vegetables are substitutes, excluded between the root and leaf vegetables as well as the stem and leaf vegetables. Vegetables are normal goods during the sample period, excluded the root in 1972-1973, leaf in 1973, stem in 1972-1976 and 1980-1992. Only fruit vegetables have no influence on habit formation, and the others do. Judging from the test of F statistics, the structural parameters of the vegetable demand revealed there were stochastic change. The test results shown that the structural change points for root vegetable occured in 1973, that for stem vegetables occured in 1985 ∼ 1987 and 1992, that for leaf vegetables occured in 1980 ∼ 1988, and fruit vegetables occured in 1976. Furthermore, the testing result of CUSUMSQ method indicated that the structural change points for stem vegetables in 1987 and for leaf vegetables occured occured in 1985 ∼ 1987. There was no structural change for other vegetables. |
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