FACT CHECK: Jeb Bush's promise of 4 percent growth is a stretch

Republican presidential candidate Jeb Bush says there's "not a reason in the world" why the U.S. economy can't grow at 4 percent annually.

Actually, there are a bunch of reasons it probably can't.

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Many economists say the U.S. economy is ill equipped to grow consistently at even close to 4 percent. Current forecasts put growth averaging half that rate. Any president, Republican or Democrat, would have to overcome decades-long trends that are largely beyond a president's control.

Those trends include the retirements of the vast generation of baby boomers — an exodus that limits the number of workers in the economy. Rising automation and low-wage competition overseas are among other factors. A result has been meager income growth, which has cut into the consumer spending that drives most economic growth.