That is because nobody expected the amount of bullshitting that could be done in order to keep the wheels on. Before 2008, QE was never really a thing, and then it hit the scene. The Fed never even reduced their balance sheet.
I have learned that one way to look at it is that there was never really a recovery since 2008, its was all just papered over. Here is an interesting chart to show the trend of the economy.
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Furthermore, 0% rates for over a decade was I'm sure something that nobody ever expected would happen. And yet, this is exactly the drug that the market needed. Its like a special promotion at a store that never goes away. Imagine Black Friday pricing every single day.
Lastly, if we look at rates for the past 40 years, we can see that each time they attempt to raise them, they always end up much lower than the previous cycle, and right before a recession.
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So my point with all of this is that its been a grind to the bottom. Nothing is better since 2008 except people got rewarded for reckless behaviour. Nobody could have predicted the lengths that they could go to in order to keep this madness going. They kept inventing new policies and procedures in order to extract even more value from the future. Its all just one big bubble and no organic growth or sustainability. Eventually when it crashes, the pain will be so much worse than if the problems were fixed back in 2008.
Just like with CPI changing the calculations, they keep changing the rules. Its easy to not have a crash when you can manipulate everything, but it doesn't mean the basis for the crash has been solved just because its been delayed by 15 years.