In the Solidarity Game (Selten and Ockenfels, 1998), two "rich" persons can support a "poor" one. A strong positive correlation between one rich person's solidarity contribution and his expected contribution of the other is observed. This paper investigates the causality behind this correlation....

Most incomes underlie some risk, i.e. ex ante they can be regarded as a lottery ticket. In every society, the lucky winners of this lottery compensate unlucky losers (unemployed workers or bankrupt entrepreneurs) privately and/or by public insurances. Do voluntary solidarity payments depend on...

In the Solidarity Game (Selten and Ockenfels, 1998) lucky winners of a lottery can transfer part of their income to unlucky losers. Will losers get smaller transfers if they can be assumed to be (partly) responsible for their zero income because they have chosen riskier lotteries (Trhal and...