Multi-homing

Whether users stick to one platform or spread across several, multi-homing, can decide whether a market tips to a single winner or stays competitive.

Multi-homing occurs when users participate on several competing platforms at the same time, rather than committing to just one. Whether the participants in a platform market multi-home or single-home is a crucial factor in how competitive that market is and whether it tends toward a single dominant player.

Single-homing and tipping

When users single-home, sticking to one platform, network effects tend to tip the market toward a single winner, because each platform's value depends on attracting the users who are committed elsewhere, and the largest platform becomes increasingly hard to challenge. This is the winner-take-all dynamic that can make platform markets so concentrated. The platform that pulls ahead draws ever more single-homing users, and rivals, unable to offer the network that users want, fall away.

Multi-homing keeps competition alive

Multi-homing changes the picture, because users who participate on several platforms at once are not lost to any of them. When people use more than one ride-hailing app, sellers list on multiple marketplaces, or viewers subscribe to several streaming services, no single platform monopolises them, and platforms must keep competing for their attention and custom. Multi-homing thus counteracts the tipping tendency of network effects, sustaining competition among platforms that single-homing would extinguish, and it is one of the main reasons some platform markets support several competitors rather than collapsing to one.

The battle over homing

Because so much hangs on it, platforms actively try to discourage multi-homing and lock users into single-homing, while users and regulators push the other way. Platforms raise the costs of using rivals, offer exclusivity incentives, and build in switching costs and features that reward commitment, all to turn multi-homing users into captive single-homers. Competition policy, conversely, often seeks to preserve or enable multi-homing, through measures that lower switching costs or mandate interoperability, precisely because multi-homing is a powerful check on platform dominance.

Multi-homing is a deceptively important concept in platform competition, the factor that often determines whether network effects tip a market to a single giant or leave room for several rivals. The contest between platforms trying to enforce single-homing and the users and regulators trying to preserve multi-homing is, in many digital markets, the contest that decides how competitive they will be.