If you truly believed this statement, you'd be able to give up your day job. Doubling down at the first sign of an appreciable drop will drive some pricing in the short run, leads to big losses as often as it pays off. Otherwise, the market would be predictably improperly priced and smart statistical analysts would make us all rich.Today and tomorrow will be the only drops, and by close on Friday, the recovery will be at least as high as todays low.