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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Almost ideal demand system ： ウィキペディア英語版 Almost ideal demand system The Almost Ideal Demand System (AIDS) (1980) is a consumer demand model used primarily by economists to study consumer behavior. The AIDS model gives an arbitrary first-order approximation to any demand system and has many desirable qualities of demand systems. For instance it satisfies the axioms of order, aggregates over consumers without invoking parallel linear Engel curves, is consistent with budget constraints, and is simple to estimate. ==Model== The AIDS model is based on a first specification of a cost/expenditure function c(u,p): :$\backslash log(c(u,p))=\backslash alpha\_+\backslash sum\_\backslash alpha\_\backslash log(p\_)+\backslash frac\backslash sum\_\backslash sum\_\backslash gamma\_^\backslash log(p\_)\backslash log(p\_)+u\backslash beta\_\backslash prod\_p\_^=\backslash alpha\_+\backslash sum\_\backslash gamma\_\backslash log(p\_)+\backslash beta\_\backslash log\backslash$ with x total expenditures, $\backslash gamma\_=1/2(\backslash gamma^$ *_+\gamma^ *_), and P is a price index: : $\backslash log(P)\backslash equiv\backslash alpha\_+\backslash sum\_\backslash alpha\_\backslash log(p\_)+\backslash frac\backslash sum\_\backslash sum\_\backslash gamma\_\backslash log(p\_)\backslash log(p\_)$. Under relevant constraints on the parameters $\backslash alpha,\; \backslash beta,\; \backslash gamma$, These budget shares equations share the properties of a demand function: * homogoeneous of degree 0 in prices and total expenditure * sum of budget shares add up to 1 (i.e., $\backslash sum\; w\_i=1$) * satisfy the symmetry of the Slutsky matrix 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Almost ideal demand system」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.