Subsidies also create excess burdens because they encourage people to consume goods valued less than the marginal social cost of production.

补贴也会产生超额负担，因为它们鼓励人们消费一些估价小于其生产的边际社会成本的商品。

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If the marginal propensity to consume increases, the multiplier increases, additional autonomous spending will have a greater compounded effect in the equilibrium of the goods market.

如果消费倾向增加，乘数增加，附加自发支出会在商品市场的均衡有更大的复合效应。

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Analyzing Engel s coefficients, change of trend of marginal consumption of varieties of goods and demand income flexibility.

分析了恩格尔系数、各类商品的边际消费倾向和需求收入弹性的变化。

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"Freemium is really a construct of the digital age because there's almost no marginal cost to digital goods, " said Chris Anderson, author of "Free: The Future of a Radical Price, " and editor in chief of Wired magazine.

WSJ: When Freemium Fails