"Given the nature of market, the chance of a crash is always greater than the chance of an overnight runaway euphoria."

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Investors are trying to work out some risk premiere that have some correspondence with actual risks. But they don't, they're not, they can't go very far that way, because the actual correspondence isn't really there in a lot of cases. So once people stop believing in these stories, and then the crash can come very, very quickly. They believe that house prices are correctly priced for some time and then suddenly they realized there's no real basis for that. But what is the correct price? We don't know that either. It's just that everything swings.

— Robert Skidelsky, Baron Skidelsky