The book "Developments on Experimental Economics" offers a comprehensive collection of contributions and speeches presented during the Experimental Economics Week in honor of Dr. Vernon L. Smith in Okayama and Kyoto in December 2004. This event included Dr. Smith's public address as well as an international conference focused on experiments in economics. In recent years, experimental economics has established itself as an indispensable tool in economic research, underscored by the awarding of the Nobel Prize to Dr. Smith in 2002. The book aims to explore new approaches and ideas to solve real-world problems through experimental methods. It provides insights into the dynamics of human behavior and interactions within the economy by discussing various experimental approaches and their results. The contributions in this volume are of interest to both researchers and practitioners who are engaged with the challenges and opportunities of experimental economics.