Factors that point to deceleration, stabilization followed by reacceleration in the U.S. stock market include growth in hiring, moderate P/E ratios, a recovery in Japan after the earthquake, and stronger corporate balance sheets. Uncertainty comes in three areas, a crisis in Greece or Portugal, slowing growth in China with rising inflation, and a sharp slowdown in U.S. growth after the end of the Fed's monetary easing. Current estimates are for 2.9% growth in the U.S. economy for 2011.