Define the price elasticity of demand and the income elasticity of demand.

定义需求的价格弹性和需求的收入弹性.

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That is, the income elasticity of demand is positive.

也就是说, 需求的收入弹性为正.

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The major determinant of income elasticity of demand is the degree of'necessity'of the goods.

需求收入弹性被用来表示消费者对某种商品需求量的变动对收入变动的反应程度.

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The milk consumption of income elasticity of demand is the highest among the husbandry foods.

在动物性食物中,奶类是需求收入弹性最高的食品.

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