Does dollar cost averaging really work?
Dollar cost averaging works if the stuff you're buying goes up within your time horizon.  It won't protect you from losing money if it doesn't. Also consider that the person (or company, or industry) that suggests dollar-cost averaging might want you to start up a regular investment program and put it on auto-pilot, which subsequently increases the chance that you won't give due attention to the fact that you're sending them money every paycheck to buy an investment that make them money regardless of whether you make money or not.