Econ Papers Daily / 期刊论文
多样性偏好：基于竞争性贸易阿明顿模型的应用
Love-for-variety: with an application to an Armington model of competitive trade
摘要
We define and characterize love-for-variety, which measures the consumer's desire to consume more variety of goods, first for general homothetic symmetric preferences, and then for the two classes of GM-CES and the three classes of HSA/HDIA/HIIA. These five classes are pairwise-disjoint with the sole exception of CES. If we depart from CES within GM-CES, the standard CES measure of love-for-variety underestimates the true love-for-variety, potentially by a wide margin. If we depart from CES within HSA/HDIA/HIIA by introducing the 2nd law of demand, the standard CES measure overestimates the true love-for-variety. We illustrate these and other results in an Armington model of competitive trade, where countries differ in the variety of goods they produce, and we show how the ACR formula for the gains from trade needs to be modified.
中文摘要
我们定义并刻画了多样性偏好，它衡量消费者消费更多种类商品的意愿，首先针对一般齐次对称偏好，然后针对GM-CES的两个类别以及HSA/HDIA/HIIA的三个类别。这五个类别两两不相交，唯一例外是CES。如果在GM-CES中偏离CES，标准的CES多样性偏好度量会低估真实的多样性偏好，且可能大幅低估。如果在HSA/HDIA/HIIA中通过引入需求第二定律偏离CES，标准的CES度量则会高估真实的多样性偏好。我们在一个竞争性贸易的Armington模型中说明这些结果及其他结果，其中各国生产的产品种类不同，并展示贸易收益的ACR公式需要如何修正。