Abstract
We study the strategic choice of compatibility between two initially incompatible network goods in a two‐stage game played by an incumbent and an entrant firm. Compatibility may be achieved by means of a converter. We derive a number of results under different assumptions about the nature of the converter (one‐way vs two‐way), the existence of property rights and the possibility of side payments. With incompatibility, entry deterrence occurs for sufficiently strong network effects. In the case of a two‐way converter, which can only be supplied by the incumbent, incompatibility will result in equilibrium unless side payments are allowed and the network externalities are sufficiently low. When both firms can build a one‐way converter and there are no property rights on the necessary technical specifications, the unique equilibrium involves full compatibility. Finally, when each firm has property rights on its technical specifications, full incompatibility is observed at the equilibrium with no side payments; when these are allowed the entrant sells access to its network to the incumbent which refuses to do the same and asymmetric one‐way compatibility results in equilibrium.
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