Furthermore, as Harvard’s Jeffrey Frankel has pointed out, regulators increased margin requirements several times this year, making it harder to buy stocks with borrowed money. And, as with all stock markets, shifts in sentiment that are not connected to fundamentals can also drive volatility.
此外，哈佛大学的杰弗里·弗兰克尔（Jeffrey Frankel）指出，监管者在今年数次提高保证金要求，使得借钱买股票更加困难。此外，和所有股市一样，与基本面无关的情绪变化也助长了波动。