刘蓉等人的“贡献”是将Boadway论文前半部分（一种公共产品的同时博弈）中的一种公共产品扩展到两种公共产品，但Boadway在论文后半部分（两种公共品的序贯博弈）指出：We choose this sequential contribution setting rather than allowing contributions to be made to the two public goods simultaneously because the qualitative results in the latter setting are similar, though much more complicated, than in the single public good setting so relatively few new insights can be gained.
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