I. Econometric Models and Optimal Economic Policy -- II. Stochastic Processes in Economic Models -- III. Recent Economic Models in Applied Optimal Control -- IV. Efficient Diversification in Optimal Portfolio Theory -- V. Portfolio Efficiency under Singularity and Orthogonality -- VI. Diversification and Robustness in Portfolio Investment: An Empirical Analysis -- VII. Efficiency Measurement in Nonmarket Systems Through Data Envelopment Analysis -- Author Index.