Ruinous competition: When countries lower their capital tax, the investors they are trying to attract are the winners (left: the trading floor of the Frank- furt Stock Exchange). But since this results in less tax revenue, the countries have less money to fund public goods like education and equal opportunity (right: Freiburg students at the education strike in 2010). Photos: Deutsche Börse AG, Kunz Public Finance Expert Wolfgang Eggert Studies Mechanisms that Get Societies into Difficult Situations Making Sense of Dilemmas by Katharina Wetzel 12