本文根据投资者冒风险是为了获得超过无风险收益的超额收益这一基本假定，构造了风险收益抵换率这一指标作为投资者进行资产选择的基础。
This paper constructed a new index: risk-return tradeoff ratio (RRTR), for portfolio selection, based on a premise that the reason of investors bearing the risks is to gain the super returns.
同时我们发现：(1)释股的关键在于释出价格与释出后期待的效率增进间的相对大小，这两因素间的抵换关系使得在释股过程得以存在一个最释比例。
Two additional findings are: 1 the key to stock floatation lies in the relative proportion of release price to the expected increase in efficiency after release.
同时我们发现：(1)释股的关键在于释出价格与释出后期待的效率增进间的相对大小，这两因素间的抵换关系使得在释股过程得以存在一个最释比例。
Two additional findings are: 1 the key to stock floatation lies in the relative proportion of release price to the expected increase in efficiency after release.
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