We employ a well-controlled laboratory experiment to examine whether only children and those with siblings differ in their willingness to compete. We find that only children are more likely to undervalue the chance of winning and shy away from competition, but they become to embrace competition as their self-assessed winning probability increases. Alternatively, once uncertainty of relative performance is removed, the gap in willingness to compete between the two groups disappears. Utilizing a two-stage model of decision weights under uncertainty, we find that such a gap is predominantly caused by their heterogeneous attitudes toward ambiguity.

中文翻译：

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有或没有兄弟姐妹：在实验性劳动力市场中进行竞争

我们采用一个控制良好的实验室实验来检查只有孩子和有兄弟姐妹的孩子在竞争意愿上是否有所不同。我们发现，只有孩子更有可能低估获胜的机会并回避竞争，但是随着他们自我评估的获胜概率的增加，他们开始接受竞争。或者，一旦消除了相对表现的不确定性，两组之间竞争意愿的差距就会消失。利用不确定性下的决策权的两阶段模型，我们发现这种差距主要是由于他们对歧义性的不同态度所致。