Al blog del professor G. Mankiw llegeixo aquest acudit. :)
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”.