Microsoft experimented with a 4-day workweek, and productivity jumped by 40%

Strange that the article doesn’t talk about how Microsoft is rolling out this change worldwide. You’d think they would - a zero-cost intervention that increases productivity 40%? Slam dunk!

So what’s more likely, that MSFT management is publicizing this result but not planning to implement it, or that this lightly-sourced Business Insider piece that talks mostly about a different company is dramatically overstating things to get clicks?

How do they measure productivity?

Any US based experiments?

Why did they stop?