In the 1950s, Harry Markowitz, an American economist, developed the modern portfolio theory. Jack Treynor (1961, 1962), William F. Sharpe (1964), John Lintner (1965) and Jan Mossin (1966) later build the Capital Asset Pricing Model (CAPM) on the theory of Markowitz. Nowadays, the CAPM is one of the primary portfolio management tools. The formula calculates the potential return percentage of an investment vehicle based on its vested risk appetite.