NO.PZ2018070201000049
问题如下：
Based on trading costs, which of the following is least likely to be impacted by liquidity?
选项：
A.Stock's trading price.
B.The difference between the buying price and selling price.
C.brokerage commissions
解释：
C is correct.
The cost of trading has three main components—brokerage commission, bid–ask spread, and price impact—of which liquidity affects the latter two. Brokerage commission is usually negotiable based on the order size.
The cost of trading has three main components—brokerage commission, bid–ask spread, and price impact—of which liquidity affects the latter two. Brokerage commission is usually negotiable based on the order size
交易成本 三个主要部分，经纪人佣金，买卖价差，价格影响。流动性影响后面2个，经纪人佣金和订单大小有关。
交易成本有佣金我理解，但买卖价差，价格影响指的是什么？交易成本不是交易过程中附带的吗？而买卖的价格高低不该是sales价格吗？怎么能归于交易成本呢？
流动性和交易成本又是什么关系呢？
这个知识点网课里有吗？学完了这一章来做这个题完全没见过这个知识点啊
