“If Something cannot Go On Forever, It will stop.”
Eventually, people will begin to understand that when a central bank exchanges one piece of paper (fiat money) for another piece of paper (a bond or security) that it changes NOTHING THAT IS REAL.
Sooner or later, it will be apparent that much of the observed economic activity is unsupported by fundamentals.
The air in the US stock market bubble will go out as will the global bubble in government bonds.
Ill-advised monetary policy is at the heart of these economic imbalances, e.g., zero-interest rate policies (ZIRP), inflation targeting & quantitative easing (QE).
Central bankers are setting up the global economy for a massive collapse due to their ignorance about how excess liquidity sets up a boom-bust cycle.