这个知识点啥意思啊

问题如下：

Client A buy one July wheat contract from Client B. On the same day,client B buy the same wheat contract from Client C. Assuming open intereststarted out at Zero, and no delivered were made, what is the addition to openinterest for July wheat contracts?

选项：

A.

0

B.

1

C.

2

D.

3

解释：

Open interest includes contracts not yet liquidated either by anoffsetting futures market transaction or delivery. When Client A buys onecontract from Client B, the current open interest is one, assuming neitherparty started with a position in that contract. When Client B buys the samecontract from Client C, Client B closes out their short transaction with anoffsetting long transaction. The open interest would not change because ClientC would simply take the place of Client B. Client A would still be long onecontract, and now Client C would be short one contract. Thus, open interestwould be one.