Trip.com took 1600 employees and randomized them into two groups. People with even numbered birthdays would continue to come into the office every day, while people with odd numbered birthdays worked at home on Wednesdays and Fridays. They found working from home raises productivity by 13%, which is massive. And they seemed a lot happier. If it works there in a setup that's not well-structured for working from home, it's likely to work better in Europe and the US.