The subhead to this story says it all: If you bought stocks when Obama said to in 2009, you’d be up 117 percent today. Of course, the market did not rebound because Obama told people to invest—it rebounded thanks to a mix of Fed action (and rumored action) that drove the market upward. But it is an example of how somebody who directly controls economic policymaking has a pretty good perspective on what the market can and cannot do for you. Japan is about to see that for themselves, potentially; its prime minister has mandated that the Nikkei go up by 17 percent next month. 

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