The presupposition of water rights transaction is distribution differentiation of space-time, non-equilibrium of supply-demand and marginal return rate differentiation of water rights owners.

水资源时空分布的差异性、供求的不均衡性和水权主体边际资源回报率的差异，是水权交易制度存在的前提和基础。

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One important element of that legislation was that the personal marginal income tax rate structure would return to its 2000 level on January 1, 2011.

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The President sought and achieved a return to the Clinton-era rates, a top marginal rate of 39.6 percent for top earners, for millionaires and billionaires.

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