3,925 bells
Joan Every Sunday from 6 a.m. - Noon
With the NASDAQ and the Dow taking a nose dive it seems as if your safest bet is the less volatile turnip market. You can buy and sell turnips for profit just like the stock market. Turnips are sold every Sunday from 6am to noon by the wandering boar Joan in bunches of 10, 50, or 100. After you buy turnips you will be able to sell them to Tom Nook any day except Sundays. His prices vary from day to day so wait until you can make a decent profit before selling them. Don't get too greedy or else you may have to sell them for a loss. After all, turnips rot after a week and are then useless.