YED(收入需求弹性)的咖啡是解释为什么。
Explain why the YED (income elasticity of demand) for coffee is high.
通常情况下，当收入增长时，消费者对某种商品需求的增加或减少将做出必然的反映，两者之间增量的比即是消费者对这种商品的收入需求弹性。
Generally speaking, when there is an increase of personal income, necessary responses will be made on the rising demand for certain commodities or services.
住房需求的收入弹性是描述居民住房需求特征的重要指标。
Income elasticity of housing demand is an important index reflecting the characteristics of housing demand.
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