A hundred dollars a month turned into eighty-four thousand dollars. Three DCA rules — backtested, specific, and most people don't know any of them. Rule one: only DCA into assets under a ten-billion-dollar market cap. Mid-caps outpace large caps by three-x in altseason — the data is clear. Rule two: don't buy on a schedule. Buy on the first Monday after a weekly red candle of twenty percent or mor…