NO.PZ2023091802000019
问题如下：
Suppose that on a
particular day there are 3,000 trades in a futures contract. Of the buyers in
those 3,000 trades, 1,800 were closing out positions and 1,200 were taking new
positions. Of the sellers in those 3,000 trades, 1,400 were closing out
positions and 1,600 were taking new positions. What is the change in open
interest during the day? Does it increase or decrease?
解释：
The open interest goes down by 200. This is because there are 1,200
new long positions and 1,400 long positions are closed out (with short trades).
Alternatively, there are 1,600 new short positions and 1,400 are closed out
(with long trades).
为什么是down呢？
