Peter Greene is flummoxed by the idea that Bill Gates leveraged his giving to persuade several districts and charter chains to spend a total of $575 million on a failed experiment to evaluate teachers by student test scores.

The experiment flopped.

He asks, what would you do if you had $575 Million to improve schools. Not that. He reminds readers that this is a lost opportunity cost. If you do X with that discretionary money, you are giving up the chance to do Y, which has real research behind it.

What is the Gates Foundation lacking? Common sense.