I'm pretty sure different economic systems could be simulated in MMO games for the benefit of mankind.
Let one game shard run with central banks, and the current economic system where banks create new credit through thin air. See how that affects the economic system in the game. How it affects house and asset prices, commodity prices and purchase power.
Let another shard run free banking with competing currencies. See how that affect asset prices, commodity and purchase power.
In yet another game world within the same system evaluate Bitcoin and see how that affects house prices, commodity prices etc.
And in another world use hard currencies such as gold and silver as purchase coin, simulate that there are limits on how much gold and silver can me mined.
Let the game worlds run for quite some time! Then evaluate which of all those system lead to the most prosperous game population, choose that for the real economy.
Too many variables will be missing. For example, you won't see how different economic systems affect scientific research and (thus) overall technological progress, which is the means by which a relatively poor person today is better off than a king 400 years ago.
Let one game shard run with central banks, and the current economic system where banks create new credit through thin air. See how that affects the economic system in the game. How it affects house and asset prices, commodity prices and purchase power.
Let another shard run free banking with competing currencies. See how that affect asset prices, commodity and purchase power.
In yet another game world within the same system evaluate Bitcoin and see how that affects house prices, commodity prices etc.
And in another world use hard currencies such as gold and silver as purchase coin, simulate that there are limits on how much gold and silver can me mined.
Let the game worlds run for quite some time! Then evaluate which of all those system lead to the most prosperous game population, choose that for the real economy.