Here’s a simple case study making the point that our political debates about economics have become largely unhinged from those among actual economists. Take the Obama stimulus plan, known as the American Recovery and Reinvestment Act. If you took your cues from the political rhetoric in Washington — or even from the occasional virulent debate in the economics blogosphere — you would think the whole question of fiscal stimulus is highly contested.

But it’s not. There’s widespread agreement among economists that the stimulus act has helped boost the economy.