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We use a controlled laboratory experiment with and without overlapping generations to study the emergence of public debt. Public debt is chosen by popular vote, pays for public goods, and is repaid with general taxes. With a single generation, public debt is accumulated prudently, never leading to over-indebtedness. With multiple generations, public debt is accumulated rapidly as soon as the burden of debt and the risk of over-indebtedness can be shifted to future generations. Debt ceiling mechanisms do not mitigate the debt problem. With overlapping generations, political debt cycles emerge, oscillating with the age of the majority of voters.

We investigate the strategic decision making of audit firms in a tendering process. In particular, we are interested in how audit firms behave to acquire audit clients and which audit quality is ensured. Our main findings are manifold. First, if two big audit firms are competing, we do not observe that each firm tries to acquire all clients. However, if one big and one small audit firm are competing, we find evidence that the big audit firm generally apply strategies to acquire all available clients. In contrast, the small audit firm uses a clear "Guerilla Strategy" which means that the firm concentrates only on few clients whereas the other clients are almost ignored. Second, small audit firms are better off if more clients do exist in the tendering process. Thus, the legislator should ensure that more audit clients are tendered if the competitiveness of smaller audit firms should be enhanced. Third, in a situation in which the competitive advantage of big audit firms increases over-proportionally, we do not observe that big audit firms are able to decrease the market share of small audit firms markedly or are even able to push small audit firms out of the market. Fourth, we find that the quality level of an audit is higher if the client is acquired by a small audit firm. This implies that increasing the number of smaller audit firms could increase the quality level of the audit market.

We test the predictions of the theoretical literature initiated by the study of Domar and Musgrave (1944) with a laboratory experiment in which subjects have to decide on the composition of an asset portfolio. Our simple design enables us to distinguish between Real Tax Effects and Perception Effects when a proportional income tax, with and without a full loss offset provision, is introduced. Observed investment behavior is partially inconsistent with the theoretical predictions if we do not control for the Perception Effects. However, if we consider these effects, we find support for the theory. The isolated Perception Effects can explain the unexpected behavior observed in previous studies and has both scientific and political implications.

AbstractReliable institutions, i.e., institutions that live up to the norms that agents expect them to keep foster cooperative behavior. We experimentally confirm this hypothesis in a public goods game with a salient norm that cooperation was socially demanded and corruption ought not to occur. When nevertheless corruption attempts came up, groups that were told that 'the system' had fended off the attempts made considerably higher contributions to the public good than groups that learned that attempts only did not affect their payoffs or that were not exposed to corruption at all.