Question

关于期货的问题

先以1千元买入一单位，等到1千2百元时卖出，然后以1千2卖出1单位做空，到1千元时平仓，问共赚到多少

Answer 1

看你是买入什么品种。比如你买一手玻璃，一手是20吨，1000元每吨，假如保证金比例是10%，则你一手要支付保证金2000元。然后你1200元卖出，则你赚了（1200-1000）*20=4000元；然后你再在1200元时卖出一手，要支付保证金2400元，再1000元时平仓，你又可以同样赚4000元，则你总共可以赚8000元。
这里面有两个是不定的。一，期货市场上的各个品种交易单位并不相同。如铁矿石是100吨/手，橡胶是10吨/手。你每次交易必须是一手的整数倍。二，保证金比例每个产品是不一样的，每个期货公司也是不一样的，统一品种的不同合约也可能不一样。并且交易所、期货公司还可以根据风险状况随时调整保证金比例。

追问

朋友，没有那么复杂，同事出的一道题，有人回答赚200，有人说400，所以来看看高手的回答，你认为答案是200，还是400？

追答

不好意思，继不是200也不是400，因为目前没有一手一吨的合约。

Answer 2

Short selling is a method of profitting when stock prices fall.

Short selling and selling short are synonymous terms. The opposite transaction would be "buying long".

If you are "short" a stock, it means that you expect the price to go down. Short selling as a strategy has several inherent risks:

1.In the long term, stock prices have generally gone up. So taking a short position is either a short-term bet against the market as a whole, or a bet against very specific companies.
2.Margin interest. Because the first part of short selling is to sell the stock, it begs the question, "how can you sell what you don't own?". Simple, you borrow it (from your broker in this case). And because you are borrowing the stock and your broker is charging you interest until you return the shares, unless the stock is going down, margin interest charges will start gnawing down your cash. This aspect is another reason that selling short is usually done in a shorter term time frame. The closing transaction is "buy to cover."
3.Unlimited liability. When you "buy long", your liability is capped. You can, at most, lose the value of your invesment (IE, if the stock costs $60 you can lose no more than $60). However, if you were to sell short and the stock price rose, there's no limit to the amount of money you could lose (as there is no theoretical upper limit on the stock price).