I'm sorry, but we might have different definitions of "large scale". There's functional, feasible, and cultural differences when it comes to trying it on 5,000 people in a small town, versus trying it on a whole state / big city and etc.

And within a limited timeframe. I'd expect people in such experimemts to act differently when they're aware that after x months/years, they'll have to find their place in the same capitalist economy again.