Three times in the past day I've heard this from employers: people who work from home are more productive. This is not data (though there's plenty out there).
One of the times I heard it was at a face-to-face meeting this morning in Boston. The meeting was informational and we sat around a table looking at each other. No handouts even. Just talking. Useful but we agreed that we would have learned more if it had been virtual. On the phone, looking at the screen, we could have shown one another stuff...and probably accelerated our thinking.
