This book presents and discusses current research in the field of economics. Topics discussed include labor market imperfections and endogenous business cycles; invariance in economic dynamics; interest rates in stochastic production economies; a cost of capital analysis of gains from securitization; modeling and forecasting income tax revenue; equity markets and economic development; links between monetary policy, inflation, output and unemployment in the euro zone; expansion of mean-variance analysis in emerging equity markets and security markets in emerging economies.