Lock-in refers to mechanisms that make it difficult or expensive for a customer to switch to an alternative provider. From a strategic perspective, lock-in is an instrument for customer retention and competitive protection. The crucial distinction is between positive lock-in (customers stay because the value is so high) and negative lock-in (customers stay because switching would be too costly or cumbersome).
Apple has built strong lock-in through its ecosystem: anyone using iPhone, MacBook, iPad, Apple Watch, and iCloud faces significant switching costs, not only financial but also through the loss of seamless integration. This lock-in is predominantly positive because the integration creates genuine added value. SAP has lock-in through implementation complexity: migrating to another ERP system is so laborious that companies often remain with SAP even when dissatisfied. This lock-in easily tips into the negative. Contracts with long terms and notice periods are the simplest form of lock-in but also the weakest, because they create no genuine attachment.
The concept traces back to Michael Porter’s analysis of switching costs. The strategic question is: Does the lock-in arise from the value we deliver, or from the difficulty of switching? Only the former is sustainable in the long run.