"You can reduce risk by building up your investments slowly with regular, periodic investments over time. Investing regular amounts monthly or quarterly will ensure that you put some of your money to work during favorable periods, when prices are relatively low. Investment advisers call this technique "dollar-cost averaging." With equal dollar investments over time, the investor buys fewer shares when prices are high and more shares when prices are low. It won't eliminate risk but it will ensure that you don't buy your entire portfolio at temporarily inflated prices. The"