"In 1985, the top five percent of the households - the wealthiest five percent - had net worth of $8 trillion - which is a lot. Today, after serial bubble after serial bubble, the top five per cent have net worth of $40 trillion. The top five percent have gained more wealth than the whole human race had created prior to 1980."

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Fear and euphoria are dominant forces, and fear is many multiples the size of euphoria. Bubbles go up very slowly as euphoria builds. Then fear hits, and it comes down very sharply. When I started to look at that, I was sort of intellectually shocked. Contagion is the critical phenomenon which causes the thing to fall apart.

— Alan Greenspan