Operating a small business, the backbone of the U.S. economy, has always been tough.

But they’ve also been disproportionately hurt by the Great Recession, losing 40 percent more jobs than the rest of the private sector combined.

Interestingly, as my research with Harvard’s Ramana Nanda shows there’s a fairly straightforward way to support small businesses, make them more profitable and hire more: pay them faster.

A major source of financing

When a business is not paid for weeks after a…