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April 28, 2021 When a shock hits the market, it’s no surprise that the values of multiple stocks drop simultaneously. For instance, one would expect COVID-19 lockdowns to cause both restaurant and gym company stocks to fall a phenomenon called comovement. Similarly, stocks tend to rise together during market upswings. But what has vexed economists is so-called “excess” comovement. This often occurs during financial crises, when the values of many stocks fall in tandem more than one would expect based on fundamental factors, such as bad news about their industries. In a financial crisis, margin traders can be forced to sell, causing stocks to drop further. “It just spirals,” says Prof. Heather Tookes. “The margin trading system can be an amplification mechanism.”

Heather tookesBige kahramanUniversity of oxford saBusiness schoolFinancial crisesஹீத்தர் எடுக்கிறதுபல்கலைக்கழகம் ஆஃப் ஆக்ஸ்ஃபர்ட் சவணிக பள்ளி