Volume.
The idea is that if you have a membership card, you are more likely to do your shopping at Tesco. Groceries are a commodity product – milk at Tesco is basically the same as any other store, so you have no reason to be loyal to any given store. If they can convince you, via the card, to do all of your shopping at Tesco they will make less profit per item, but more total profit because you spend more money with them in aggregate; I’d rather you spend $100 with me at a 10% profit margin ($10) than $50 with me at a 15% profit margin ($7.50).
They also get a data stream. Since you use your card with every purchase, they know what **you** are purchasing, which is valuable information to CPG companies when determining what products to produce and what prices make sense.
When you sign up for one of these loyalty cards, you have to give them certain personal details and permission to use your data for certain purposes. You get small discounts/bonuses for scanning the card when you buy something, which incentivizes you to do so. They use this to build up a detailed picture of your spending habits. They can then make targeted offers to entice you to shop there more frequently, can use the data they collect on everyone to inform their business decisions, and may also sell it on to other companies.
Two main reasons.
Incentive to shop exclusively at the one place. They lose fewer sales, more than making up for the tiny discounts they offer
Customer information. They are tracking and profiling their customers, that info on you, your shopping habits, when you shop, when you run out of things etc. is worth orders or magnitude more than the tiny discounts they offer.
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