Markets alone cannot provide adequate protection against the risk of unemployment. Private unemployment insurance (UI) fails because of informational problems: the so-called moral hazard (changes in behavior in the presence of insurance that are impossible or very costly to detect) and adverse selection problems (high-risk workers make insurance unattractive to average- and low-risk workers). Hence the mandate for social policy. But social policy has to deal with the same problems that render markets inefficient. Mandatory participation mitigates the problem of adverse selection, but the moral hazard problems remain. In addition, the existence of a social protection program may give rise to inefficiencies of its own. Particularly with the rise of unemployment in European Union in the last two decades, inefficiencies created by UI, the traditional and most widely used public program of income support for the unemployed in developed economies, have become more widely discussed, and solutions and alternatives sought.