Since World War II, the United States economy has on average done significantly better when a Democrat has occupied the White House. Economists Alan Blinder
and Mark Watson
take a look at why this might be in a new paper
. Their conclusion: it's basically comes down to luck.
Matthew Yglesias at Slate argues
that the paper isn't all that convincing and kinda-sorta makes the case that the policies of Democratic presidents may help explain this correlation. Even he admits upfront that he won't be changing anyone's mind. Obviously it's impossible to draw any real conclusions either way from a chart like the above.