These three volumes contain edited versions of papers and commentaries presented at invited symposium sessions of the Tenth World Congress of the Econometric Society 2010. The papers summarize and interpret key developments in economics and econometrics and they discuss future directions for a variety of topics, covering both theory and application. Written by the leading specialists, these volumes provide a unique, accessible survey of progress on the discipline. The first volume addresses economic theory, focusing on nonstandard markets, contracts, decision theory, communication and organizations, epistemics and calibration, and patents. The second volume addresses applied economics, with specific focuses on finance, political economy, trade and firm dynamics, economic growth, and perspectives on Chinese economic growth. The third volume primarily addresses econometrics, with specific focuses on the econometrics of industrial organization, macroeconometrics, econometric theory, empirical microeconomics, time series and panels, and the Mirrlees Review on tax reform in the twenty-first century.