保证金率 meaning in English

margin rate

Obviously , there could be no guarantee that this would once again be the case , but if history is any guideline ? and if business and corporate earnings were to continue on the same course ? continued optimism over the outlook for the stock market would seem more prudent than pessimism
保证金率从50 %增长到70 % ，并不是想要遏制群众方面猖獗的投机，而是联邦储备委员会想要保持现存于股市强劲基础? ?事实上股市由于群众非常庄严的参与? ?在技术上看起来相当强劲。