The roller-coaster ride is far from over. The stock market suffered its worst day in over a month Monday, taking a plunge amid worries that consumers aren't keeping up with the global rebound. The Dow fell 186 points, while the Nasdaq dropped 55. "Investors speculated that a rally in riskier assets has outpaced prospects for economic growth," Bloomberg reports. China's stock market also declined substantially, falling 5.8 percent. "It's not going to be a straight line up," an observer said. Just last Thursday, the Dow was at a nine-month high.