These two volumes include important contributions by eminent Japanese researchers and their coauthors on advances in behavioral economics and finance. Behavioral Economics of Preferences, Choices, and Happiness covers decision making and human well-being. Key topics include decision making under the conditions of inter-temporal choices, risk and social relations, happiness, and the neuro-scientific and biological basis of behavior. Behavioral Interactions, Markets, and Economic Dynamics focuses especially on economic studies that examine interactions of multiple agents or market phenomena or both by using behavioral economics models.  Together, the two volumes effectively enable readers to broaden and deepen their understanding of the fascinating and highly significant topics of behavioral economics and finance.