能否解释一下低买高卖的过程？和 股票里的 short position leverageposition分别有什么关系呢？
问题如下图：
选项：
A. 
B. 
C. 
解释：
NO.PZ2016031201000018 问题如下 arbitrage transaction generates a net inflow of fun: A.throughout the holng perio B.the enof the holng perio C.the start of the holng perio C is correct.Arbitrage is a type of transaction unrtaken when two assets or portfolios prointicresults but sell for fferent prices. A trar buys the asset or portfolio with the lower priansells the asset or portfolio with the higher price, generating a net inflow of fun the start of the holng perio Because the two assets or portfolios prointicresults, a long position in one anshort position in the other means ththe enof the holng perio the payoffs offset. Therefore, there is no money gaineor lost the enof the holng perio so there is no risk. 中文解析套利是对产生同样收益但价格不同的单个资产采取低买高卖的行为。这一行为发生在持有期期初，对投资者产生了正的持有期收益。在投资期末，因为两个资产收益相同，可以相会抵消，所以不存在风险。 套利有Forwar那得在未来交割才能套呀，为什么T=0就能套利了呢。 倒回去看基础班老师花的图也是CF=0 ，只是期初有个S0的价值。请问是概念哪里混淆了吗
NO.PZ2016031201000018 问题如下 arbitrage transaction generates a net inflow of fun: A.throughout the holng perio B.the enof the holng perio C.the start of the holng perio C is correct.Arbitrage is a type of transaction unrtaken when two assets or portfolios prointicresults but sell for fferent prices. A trar buys the asset or portfolio with the lower priansells the asset or portfolio with the higher price, generating a net inflow of fun the start of the holng perio Because the two assets or portfolios prointicresults, a long position in one anshort position in the other means ththe enof the holng perio the payoffs offset. Therefore, there is no money gaineor lost the enof the holng perio so there is no risk. 中文解析套利是对产生同样收益但价格不同的但个资产采取低买高卖的行为。这一行为发生在持有期期初，对投资者产生了正的持有期收益。在投资期末，因为两个资产收益相同，可以相会抵消，所以不存在风险。
NO.PZ2016031201000018 问题如下 arbitrage transaction generates a net inflow of fun: A.throughout the holng perio B.the enof the holng perio C.the start of the holng perio C is correct.Arbitrage is a type of transaction unrtaken when two assets or portfolios prointicresults but sell for fferent prices. A trar buys the asset or portfolio with the lower priansells the asset or portfolio with the higher price, generating a net inflow of fun the start of the holng perio Because the two assets or portfolios prointicresults, a long position in one anshort position in the other means ththe enof the holng perio the payoffs offset. Therefore, there is no money gaineor lost the enof the holng perio so there is no risk. 中文解析套利是对产生同样收益但价格不同的但个资产采取低买高卖的行为。这一行为发生在持有期期初，对投资者产生了正的持有期收益。在投资期末，因为两个资产收益相同，可以相会抵消，所以不存在风险。 1、这道题和时间套利，空间套利有关吗？时间或空间结果都一样吗？2、解析实在没看懂，题干很精简，就说套利产生净流入，怎么能判断就是结尾收益相同，发生在期初呢？这好牵强。老师讲课说，期初long远期，借钱存进去，期末存钱收益大于远期，交割有利润，归还借款。这种交割不是期末发生吗？
NO.PZ2016031201000018问题如下arbitrage transaction generates a net inflow of fun:A.throughout the holng perioB.the enof the holng perioC.the start of the holng perio C is correct.Arbitrage is a type of transaction unrtaken when two assets or portfolios prointicresults but sell for fferent prices. A trar buys the asset or portfolio with the lower priansells the asset or portfolio with the higher price, generating a net inflow of fun the start of the holng perio Because the two assets or portfolios prointicresults, a long position in one anshort position in the other means ththe enof the holng perio the payoffs offset. Therefore, there is no money gaineor lost the enof the holng perio so there is no risk. 中文解析套利是对产生同样收益但价格不同的但个资产采取低买高卖的行为。这一行为发生在持有期期初，对投资者产生了正的持有期收益。在投资期末，因为两个资产收益相同，可以相会抵消，所以不存在风险。 为什么ring the perio行？
NO.PZ2016031201000018 问题如下 arbitrage transaction generates a net inflow of fun: A.throughout the holng perio B.the enof the holng perio C.the start of the holng perio C is correct.Arbitrage is a type of transaction unrtaken when two assets or portfolios prointicresults but sell for fferent prices. A trar buys the asset or portfolio with the lower priansells the asset or portfolio with the higher price, generating a net inflow of fun the start of the holng perio Because the two assets or portfolios prointicresults, a long position in one anshort position in the other means ththe enof the holng perio the payoffs offset. Therefore, there is no money gaineor lost the enof the holng perio so there is no risk. 中文解析套利是对产生同样收益但价格不同的但个资产采取低买高卖的行为。这一行为发生在持有期期初，对投资者产生了正的持有期收益。在投资期末，因为两个资产收益相同，可以相会抵消，所以不存在风险。 问题如下arbitrage transaction generates a net inflow of fun:A.throughout the holng perioB.the enof the holng perioC.the start of the holng perioC is correct.Arbitrage is a type of transaction unrtaken when two assets or portfolios prointicresults but sell for fferent prices. A trar buys the asset or portfolio with the lower priansells the asset or portfolio with the higher price, generating a net inflow of fun the start of the holng perio Because the two assets or portfolios prointicresults, a long position in one anshort position in the other means ththe enof the holng perio the payoffs offset. Therefore, there is no money gaineor lost the enof the holng perio so there is no risk. 中文解析套利是对产生同样收益但价格不同的但个资产采取低买高卖的行为。这一行为发生在持有期期初，对投资者产生了正的持有期收益。在投资期末，因为两个资产收益相同，可以相会抵消，所以不存在风险。这道题讲的应该是空间套利吧，所以net inflow产生在0时刻（the start of the holng perio但是当时间套利的时候，按照老师上课的讲解net inflow 产生在T时刻，即the enof the holng perio那么请问考试时如何分辨题目中提到的Arbitrage到底是 空间套利还是时间套利呢？
