By investing smaller amounts over a longer period of time, you can benefit from dollar cost averaging.
Dollar-cost averaging is a strategy in which a person invests a fixed dollar amount on a regular basis, usually monthly purchase of shares in a mutual fund. When the fund’s price declines, the investor receives slightly more shares for the fixed investment amount, and slightly fewer when the share price is up. This strategy results in lowering the average cost per unit, by taking advantage of any market decline as a buying opportunity.