Markets sold off quite sharply on Monday in response to the developments in Greece last weekend. Investors had just learned that Greece's stock market and banks would be closed for the week, and capital controls would begin with a 60 euro-limit on ATM withdrawals. The euro tanked, and US stocks had their worst single day in several months, with the Dow plunging 350 points, the S&P falling more than 2%, and both indexes going red for the year.