My projection is that this is resulting from a lot of circular investing. Fund A gives money to company B, who has more money than they can spend so it goes to fund C, and then that goes to company D, etc. We've learned that you are not supposed to have idle capital. And yet we keep so much of our wealth as money, the only way to deploy it is to send it in a circle. Valuations go up, prices and costs don't. Unfortuna…
That end is called raising the interest rate. When the rate hits some magic phase transition number where enough people believe you can invest in safe liquid accounts for more than the return on risky assets then the whole thing collapses. But then it'll get propped up again afterwards and everybody believes that now.
That's what FED and interest rates exist to do. Create and pop bubbles.
As the FED raises interest rates, money will start trickling out of "riskier" assets. The quicker the FED raises interest rates, the more quickly money will leave. Then we get a recession and when the FED feels they've sopped up enough money from the economy, then they will lower interest rates to get more money into the system, get more economic activity and re-inflate asset prices.