I do know some of the world's richest people. In monetary terms, they all performed very well. In terms of a fulfilling life, I am less sure.
Each money-printing exercise brings about unintended consequences. These unintended consequences are higher inflation rates than had no money been printed.
The reason I am so negative about the Federal Reserve's policies is that they only target core inflation and argue that they can't identify bubbles, but when each bubble bursts, they flood the system with liquidity that brings about unintended consequences.
Now, McDonald's is a very good indicator of the global economy. If McDonald's doesn't increase its sales, it tells you that the monetary policies have largely failed in the sense that prices are going up more than disposable income, and so people have less purchasing power.
I am pretty sure central banks will continue to print money, and the standards of living for people in the western world, not just in America, will continue to decline because the cost of living increases will exceed income. The cost of living will also go up because all kinds of taxes will increase.
When you print money, the money does not flow evenly into the economic system. It stays essentially in the financial service industry and among people that have access to these funds, mostly well-to-do people. It does not go to the worker.