看之前有个人的问题老师的回答：“题目不是想表达做市商报价比市场低，而是想表达当前市场价差比前一日大了。”
请问如何判断为什么不是说报价比前一天低，比如买入价低了，可能会觉得是不是1，交易小，2和银行关系好。
怎么能知道是比的差价呢？
问题如下图：
选项：
A. 
B. 
C. 
解释：
NO.PZ2018091706000042问题如下Bfirm is Americcompany anexports steel to a firm whiis in Englan Assume Breceives the payment of 3,600,000 Gnow anit wants to change these poun into llars. The spot exchange market rate is 1.5500 USGfor bian1.5505 for ask. A y after, Bcalls a aler who quotes 1.5498 USGfor bian1.5507 for ask. Whiof the following reasons cannot explain the aler quote?A.Because it is a small transaction.B.Because the New York anLonn exchange market are not both open.C.Because the volatility of market is getting large. A is correct.考点Factors thaffethe bioffer sprea析我们观察到交易商A的报价的价差是0.0009（ =1.5507-1.5498 ）明显高于前一日的市场报价的价差0.0005（ 1.5505-1.5500 ）。能够把外汇市场卖价差拉大的原因包括市场风险加大；纽约和伦敦市场没有同时开市，市场流动性减少 ；以及交易量过大，抽干了市场的流动性。A说法反了，所以入选不能的。 强化班老师说过，纽约和伦敦的外汇市场是同时开市的，各自的loctime不同而已，我听错了？讲义中那两个时间都是纽约时间？
NO.PZ2018091706000042 问题如下 Bfirm is Americcompany anexports steel to a firm whiis in Englan Assume Breceives the payment of 3,600,000 Gnow anit wants to change these poun into llars. The spot exchange market rate is 1.5500 USGfor bian1.5505 for ask. A y after, Bcalls a aler who quotes 1.5498 USGfor bian1.5507 for ask. Whiof the following reasons cannot explain the aler quote? A.Because it is a small transaction. B.Because the New York anLonn exchange market are not both open. C.Because the volatility of market is getting large. A is correct.考点Factors thaffethe bioffer sprea析我们观察到交易商A的报价的价差是0.0009（ =1.5507-1.5498 ）明显高于前一日的市场报价的价差0.0005（ 1.5505-1.5500 ）。能够把外汇市场卖价差拉大的原因包括市场风险加大；纽约和伦敦市场没有同时开市，市场流动性减少 ；以及交易量过大，抽干了市场的流动性。A说法反了，所以入选不能的。 如果两者总是不同时开市，怎么能sprea大呢？因为这个流动性的变量在前一天和后一天并没有变化啊
NO.PZ2018091706000042 问题如下 Bfirm is Americcompany anexports steel to a firm whiis in Englan Assume Breceives the payment of 3,600,000 Gnow anit wants to change these poun into llars. The spot exchange market rate is 1.5500 USGfor bian1.5505 for ask. A y after, Bcalls a aler who quotes 1.5498 USGfor bian1.5507 for ask. Whiof the following reasons cannot explain the aler quote? A.Because it is a small transaction. B.Because the New York anLonn exchange market are not both open. C.Because the volatility of market is getting large. A is correct.考点Factors thaffethe bioffer sprea析我们观察到交易商A的报价的价差是0.0009（ =1.5507-1.5498 ）明显高于前一日的市场报价的价差0.0005（ 1.5505-1.5500 ）。能够把外汇市场卖价差拉大的原因包括市场风险加大；纽约和伦敦市场没有同时开市，市场流动性减少 ；以及交易量过大，抽干了市场的流动性。A说法反了，所以入选不能的。 一般多大量的交易会算large transaction呀？
NO.PZ2018091706000042 问题如下 Bfirm is Americcompany anexports steel to a firm whiis in Englan Assume Breceives the payment of 3,600,000 Gnow anit wants to change these poun into llars. The spot exchange market rate is 1.5500 USGfor bian1.5505 for ask. A y after, Bcalls a aler who quotes 1.5498 USGfor bian1.5507 for ask. Whiof the following reasons cannot explain the aler quote? A.Because it is a small transaction. B.Because the New York anLonn exchange market are not both open. C.Because the volatility of market is getting large. A is correct.考点Factors thaffethe bioffer sprea析我们观察到交易商A的报价的价差是0.0009（ =1.5507-1.5498 ）明显高于前一日的市场报价的价差0.0005（ 1.5505-1.5500 ）。能够把外汇市场卖价差拉大的原因包括市场风险加大；纽约和伦敦市场没有同时开市，市场流动性减少 ；以及交易量过大，抽干了市场的流动性。A说法反了，所以入选不能的。 B错在哪里
NO.PZ2018091706000042 Because the New York anLonn exchange market are not both open. Because the volatility of market is getting large. A is correct. 考点Factors thaffethe bioffer spre解析我们观察到交易商A的报价的价差是0.0009（ =1.5507-1.5498 ）明显高于前一日的市场报价的价差0.0005（ 1.5505-1.5500 ）。能够把外汇市场卖价差拉大的原因包括市场风险加大；纽约和伦敦市场没有同时开市，市场流动性减少 ；以及交易量过大，抽干了市场的流动性。A说法反了，所以入选不能的。 影响aler的sprea因素，不是有一个是transaction size吗，size越大sprea小，为什么这里不是因为transaction size小，导致sprea大呢？
