Antagonistic cooperation

What does Antagonistic cooperation mean in American Law?

The definition of Antagonistic cooperation in the law of the United States, as defined by the lexicographer Arthur Leff in his legal dictionary is:

A relationship between or among persons in which they join their efforts to produce something of value to the participants, while at the same time being in conflict over other things, most particularly the division among themselves of the product of their joint efforts. The term has some currency in sociology. It has, oddly enough, almost none in economics, even though the normal alliance of factors of production in modem economic aggregates, e.g., between labor and capital in a corporation, marvelously exemplifies the term and concept. Indeed, in a somewhat less obvious sense normal economic trading also exhibits antagonistic cooperation, in that parties to a trade can both increase their utilities by exchange, but still contend over the ratio between the traded goods, i.e., over the price.