A multiplayer online game created in Sweden once had two economists from the University of Stockholm look into game economy and submit their recommendations, which were soon implemented. The number of users in said game was rising at the time. One-and-half years later, it peaked and never rose again.
Spoiler: Hattrick, and this happened in 2007-2009. (source)
I would love to have an area where I could 'play' with new economics. I fully expect old economists would look, well... old... if they talked about it. In theory MA could create any kind of 'protected economy' or even set of economies, but yeah, they have fallen behind what they even used to have once upon a time...