Income redistribution with an efficiency loss is expected to have a twofold negative effect on support for redistribution, as it lowers egoistic support for redistribution and activates efficiency preferences. This study tests whether such a negative relationship exists, increases with the size of efficiency loss and interacts with group communication and the income position. We present a laboratory experiment in which subjects receive a randomly allocated income and must coordinate on a majority tax rate using a deliberative communication tool. The rate of money lost as a part of the redistribution process is manipulated as a treatment variable (0%, 5%, 20%, or 60%). Experimental evidence shows that efficiency loss exerts a robust negative effect on support for redistribution. The effect shows a tipping point pattern, is stronger at the lower end of the income distribution and is not fully explained by egoistic preferences. Inefficiency matters mostly for the chosen tax rate after group communication. At an efficiency loss of 60%, however, group communication does not affect support for redistribution, which implies that inefficiencies tend to play a minor role in the context of redistribution as long as they are within a moderate range.

JEL Classification: C91, C92, D63, D72

具有效率损失的收入再分配预计将对支持再分配产生双重负面影响，因为它降低了对再分配的利己主义支持并激活了效率偏好。这项研究测试了这种负相关关系是否存在，是否随着效率损失的增加而增加，并与群体沟通和收入状况发生相互作用。我们提供了一个实验室实验，其中受试者获得随机分配的收入，并且必须使用协商性沟通工具协调多数税率。作为重新分配过程一部分的金钱损失率作为处理变量（0％，5％，20％或60％）进行操作。实验证据表明，效率损失对支持再分配产生了强烈的负面影响。效果显示了临界点模式，在收入分配的较低端更强，并且不能由利己主义偏好完全解释。群体沟通后，低效率对于选择的税率而言尤为重要。但是，在效率损失为60％的情况下，小组沟通不会影响对重新分配的支持，这意味着，只要效率不高，只要它们处于适度的范围内，便会在重新分配的情况下发挥较小的作用。

JEL分类： C91，C92，D63，D72