From Kiplinger:
The stock market has had a good run since 2009. So good, in fact, that a growing chorus of seers fears that U.S. stocks will deliver little appreciation in coming years. Goldman Sachs strategist David Kostin, one of those pessimists, figures that over the next decade Standard & Poor’s 500-stock index will return about 5% annualized, a figure that includes both price gains and dividend income. Kiplinger’s is a bit more upbeat; we expect 6% to 8% a year. In either case, the market is likely to return far less than the historical average of 10% annualized.