As demand to substantiate predictions from economic theory with causal empirical evidence increases, economists have more and more turned towards controlled laboratory experiments. As this field has blossomed it has provided evidence confirming some of the key predictions of economic theory and exposed some of the weaker theoretical predictions. This has resulted in a symbiotic relationship where experimental evidence not only is used to support theoretical conclusions but has pointed economists into bold and exciting new areas of investigation. In this volume, I am proud to present some of the most stimulating work in this field.