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To: donss who wrote (2268)3/17/1998 2:25:00 PM
From: ccryder  Read Replies (1) | Respond to of 10852
 
Option writers can be the public and they are also CBOE member firms that make the option markets. The member firms are obligated to sell or buy options to/from the public. Paring between the public buys and sells is done but this is not necessary to determine option availability. It looks like to me any imbalance in price from one option series to the next caused by public demand is quite short lived.

It also appears to me, but I have not seen it stated, that the open interest could be calls (or puts) sold or bought, and you can't tell which.