NO.PZ201512181000007301
问题如下：
Based on Exhibit 1, the inside bid–ask spread for the limit order book for Light Systems is closest to:
选项：
A. $0.04.
B. $0.07.
C. $0.10.
解释：
A is correct. The inside bid–ask spread, or market bid–ask spread, is the difference between the highest bid price and the lowest ask price. The highest bid price for Light Systems is $17.15, and the lowest ask price is $17.19. Therefore, the inside bid–ask spread = $17.19 – $17.15 = $0.04.
0.04不是根据公式的话需要*2的吗？
