Loyalty
How long people stick with the brand & why
Loyalty is not satisfaction and it is not habit: it is when someone has better options and chooses you anyway, which is a much rarer and more valuable thing.
A loyal customer is not simply a repeat customer. Repeat purchases can happen out of inertia, convenience, or the absence of a better option. True loyalty involves an active preference: the customer has considered alternatives and returned to you anyway, often because the relationship has value that goes beyond the transaction. Understanding what creates that preference is one of the most strategically important things a brand can research.
Loyalty programs are the most common response to this challenge, but they often measure something closer to lock-in than to loyalty. Customers who stay because of accumulated points or switching costs are not the same as customers who stay because the brand means something to them. Both have value, but they require very different strategies to sustain, and conflating them leads brands to invest in mechanics that do not build the thing they think they are building.