Public good and private good valuation for waiting time reduction: a laboratory study

In a laboratory experiment, subjects were endowed with money and waiting time. Preferences for waiting time reduction were elicited with salient rewards both as a private good and as a public good. The allocations of the public good that were theoretically predicted by the Nash equilibrium and the Lindahl equilibrium, respectively, were computed from the individual private good valuations and compared with the subjects’ actual contributions. We found a significant positive correlation between private good valuations in terms of willingness-to-pay and public good valuations in terms of voluntary contributions. Group contributions to public waiting time reduction significantly exceeded the non-cooperative prediction and were close to the socially optimal level. However, for a majority of subjects, the Lindahl equilibrium was not able to predict the observed contributions.