David Brooks recounts a disagreement over stimulus between the U.S. and Germany:

The debate got pointed. American economists accused German policy makers of risking a long depression. The German finance minister, Wolfgang Schäuble, countered, “Governments should not become addicted to borrowing as a quick fix to stimulate demand.”

The two countries followed different policy paths. According to Gary Becker of the University of Chicago, the Americans borrowed an amount equal to 6 percent of G.D.P. in an attempt to stimulate growth. The Germans spent about 1.5 percent of G.D.P. on their stimulus.

This divergence created a natural experiment. Who was right?

The early returns suggest the Germans were.

How can economics be a science when it doesn't have to accept repeated, well documented results?