The central banks essentially have unlimited power to prop up the stock and bond markets. In the past, Stanley Druckenmiller found that the loss of liquidity caused stock market crashes. The central banks learned from this and just keep injecting more liquidity to prop up the markets in the face of insurmountable debt loads. The Bank of Japan buys both bonds (quantitative easing = QE) and stocks. The European Central Bank buys bonds. The US has stopped buying bonds for now. Not only are the bonds and stocks in a bubble, the central bank balance sheets are also in a bubble. Mr. Druckenmiller sold all of his gold the night of president Trump's election in November, 2016, and reentered gold in February, 2017 (source Forbes). Many economists and traders predict inflation (gold rising) while Harry Dent predicts deflation (everything falling including gold). I am long GDX.