The answer to this question is that a mix of 60 percent of common stocks and 40 percent of bonds is the common recommendation of financial planners.
Those who are approaching retirement and want to invest or save for their retirement a mix of stocks, bonds, and amounts of savings will do in order for them to achieve their goal in having a retirement fund. Mixing in this kind of fund is also known as asset allocation. Asset allocation is a strategy in investing where in the investor balances the risks and reward by focusing on the investment goal of the person / investor.
