2024全國醫學博士英語作文預測：新冠病毒和市場動蕩

Start with the first, volatility. Equity market instability might feed on itself.
　　The VIX, which measures the expected volatility implied by the price of options on the S&P 500 index,
　　vaulted from around 15 to above 27 in a matter of days. Some investment strategies are particularly sensitive to it.
　　For example when volatility is low, they allow for a bigger weighting of equities in portfolios.
　　But when it rises and stays high, some investors are forced to unload some of their holdings—creating yet more volatility.