This year the stock price of Zoom Video Communications has soared more than 500%. Similarly, the wealth of Eric Yuan, a Chinese-born poster boy of Coronavrious economy, was at one point worth $28.6 bn — to become the 40th wealthiest person on the world. It took a hit on Monday after Pfizer said the COVID-19 vaccine prevented more than 90% of infections in a study. Zoom shares fell 17% in New York, erasing $5.1 bn from Yuan’s net worth.

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