Economist Paul Samuelson famously quipped that stock markets accurately predicted nine of the last five recessions. The same could be said of financial economists. So-called leading indicators like market sentiment swing with the daily news. Optimism is the default option but bull markets die hard. Still, most seasoned financial economists now recognise that stock markets are becoming more fragile. And so does the crowd. The frequency of online searches for “stock market bubble” has surged since…
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