We employ an experimental approach to consider the impact of a combination of formal and informal sanctions on contribution levels for a specific type of public good. We find that when both sanctions are available, contributions and overall welfare are higher than when only one of the two...

An English clock auction and a sealed-bid auction with lowest accepted-bid pricing are studied in a controlled laboratory setting. Buyers bid for either a single unit or two units of the good. The sealed-bid auction generates more revenue than the English clock auction in both cases. The revenue...