比如说，一个看涨期权，可以让持有者有权在一段特定的时间内以一个特定的价格买入一个资产。
A call option, for example, gives the holder the right to buy an asset at a specified price within a specified period.
由买入一个期货合同和买入一个看跌期权的组合，就叫做组合买入看涨。
A combination of a long futures contract and a long put, called a synthetic long call.
流动人口的劳动力价值具有期权特征，劳动力流入地相当于持有一份买入看涨期权。
The labor-force has the Characteristic of options value and the regions with labor inflow are equivalent to hold a long call option of the floating population.
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