Securities investment funds based on utility maximization model of research and application

Consider the restriction of short selling of securities based on risk, Use utility Function U = a₀ + a₁R_p + a₂R_p² + a₃σ_p² The Presence of risk-free asset portfolio optimization model for research and application, given the expected utility maximization when the risk-free assets and risk weighted portfolio analytical expression; through a numerical example is given of its application; this investment solution optimal investment portfolio weighting method on the theory and practice can learn from nature.