When there is a diminishing marginal rate substitution, preferences are convex.
边际替代率是逐渐减少得，偏好就会凸起。
Comparing and Analysing on Models of Calculation and Statistical Testing of Nosynonymous Substitution Rate and Synonymous Substitution Rate during Gene Evolution
基因进化的同义与非同义替代计算及统计检验的比较分析
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