问题如下:
A trader shorts 100 shares when the price is USD 50. The initial margin and maintenance margin are 150% and 125%. What is the initial margin required? How high can the share price go before further margin is required? (Ignore interest payments.)
选项:
解释:
The trader is initially required to contribute USD 2,500 in addition to the USD 5,000 obtained from selling the shares, creating a margin balance of USD 7,500. If the USD share price rises to X, the maintenance margin becomes 100 * 1.25X = 125X. This is greater than the 7,500 margin balance when X > 7,500/125, that is, when X > 60.
听了李老师讲的 真的不明白
维持保证金不应该是100*50*125%=6250吗?为啥他讲的维持保证金是个变量
我的算法:7500-6250=1250 100*(50-X)= -1250 得出X=62.5