This article investigates Rugina’s orientation table and gives particular examples for several of its seven models. Leon Walras’s Economics of Stable Equilibrium and Keynes’s Economics of Disequilibrium are combined in Rugina’s orientation table in systems which are s percent stable and...

Each individual investor is different, with different financial goals, levels of risk tolerance and personal preferences. From the point of view of investment management, these characteristics are often defined as objectives and constraints. Objectives can be the type of return being sought,...

This paper proposes a family of estimators of population mean using information on several auxiliary variables and analyzes its properties in the presence of measurement errors.