NO.PZ202304060100015101
问题如下：
Compared with Varga’s first trade, the second trade had an effective spread cost that was:
选项：
A.
greater but was executed within the quoted spread.
B.
less but was executed outside the quoted spread.
C.
greater and was executed outside the quoted spread.
解释：
The effective spread cost estimate for buy orders is calculated as Trade size × {Trade price − (Bid + Ask/2)} or as follows:
For the first trade: 1,000 × (79.80- 77.65)/2) = 1,075.
For the second trade, there are still 200 shares offered by Dealer B at 79.95. Therefore, the effective spread cost is 1,000 × (79.95- 77.65)/2) = 1150.
The effective spread cost was larger for the second trade, and the execution price of 79.99 was executed outside the quoted spread.
完全没看懂啊，是从哪里开始算？