That we seem to have avoided another Great Depression doesn’t mean our economy is anywhere near as strong as it should be. In fact, most indicators—from unemployment to private investment—prove quite the opposite. What can be done? How can we ensure the U.S. enjoys not merely a modest recovery but the kind of buoyant prosperity we saw in the decades after World War II and briefly in the 1990s? We put the question to few political economists and will run their thoughts over the next couple weeks.