The 10% correction that rocked US equity markets earlier this month was jarring and painful for investors. But it also gave them a dry run for a major market meltdown.<br />As a result, traders now have a good idea what tactics will work when defending against sharp losses. Considering Morgan Stanley thinks the worst is yet to come, that's a major positive.<br />Andrew Sheets, Morgan Stanley's chief cross-asset strategist, wrote in a client note, the sell-off was an "appetizer, not the main course. <br />
