I am now writing a paper (one of four chapters in my present project) on the negotiation and transactions between two parties. The two parties may include relations between firm to firm and between firm to consumers. I am thinking that this form of transaction is more fundamental and typical of all forms of transactions, of which organized markets like security and commodity exchanges are uniquely highlighted in the textbooks.
A possibility is face-to-face transaction. This term is fairly good in indicating the difference against the organized markets. The inconvenience is that it is opposed to transactions through internet or telephone transactions in legislation. I want the term to included transactions by internet between two parties.
Another possibility is two-party transaction. This term seems to have also some special connotations in law, but engenders fewer confusions.
Do you know any other good expression? If you do not, which of the above two possibilities do you judge more preferable for my study?
In addition, is there any paper which argued my question, i.e. the opposition between organized market transaction and transactions between two parties?