Strategic alliances, shared facilities, and entry deterrence

In this article we explore some possible anticompetitive effects of one par ticular type of strategic alliance-common in the airline industry among oth ers-that involves the sharing of production capacity. An offer to share an existing facility can allow an incumbent to persuade a potential entrant no t to build its own facility. We Establish conditions under which an agreeme nt to share will be anticompetitive in the sense that, absent the agreement , a more competitive outcome (i.e., entry with new capacity) would have obt ained. Such alliances can reduce welfare even if the incumbent and entrant will not be direct competitors.