A worse joke

I decided that my last joke was too funny and not reliant enough on arcane knowledge.  So, I give you a tale from Greg Mankiw's blog.

A group of macroeconomists are sitting on a panel at a conference discussing developments in the discipline.

In a heated exchange, the New Keynesian says to the Real Business Cyclist: “You guys have put macroeconomics back twenty years with this nonsense!”

The Real Business Cyclist smiles and says “So you DO believe in negative productivity shocks after all.”