The "feasible set" and "efficient set" differ because:

		the feasible set considers all portfolios of risky stocks, whereas the efficient set includes only stock portfolios with minimum risk for a given level of expected return
		the feasible set plots the expected return and standard deviation for all possible portfolios while the efficient set consists of only those portfolios offering the lowest expected return for a given level of standard deviation
		the feasible set consists of all possible portfolios of assets, whereas the efficient set includes only those portfolios which maximize expected returns for any given level of volatility
		the feasible set contains portfolios in which the correlation between assets lies between 1.0 and 1.0, whereas the efficient set contains portfolios of assets with correlations that are always less than one
		the feasible set will always be a subset of the efficient set