How does a grocery or food store in Kuwait get repeat customers?
By reaching the customer at the moment the first purchase runs out, through a channel that does not charge per message. Almost every store has the timing data and spends the reach budget anyway.
The mechanics of a second order
Work out the median gap between first and second order. Whatever that number is, the reminder belongs slightly before it — after it, the customer has already solved the problem somewhere else.
Winning a customer costs money and selling to them again costs almost nothing, and most budgets are spent as though the reverse were true. For a grocery or food store in Kuwait, the answer turns on one thing in particular: Grocery margins are thin and baskets are large, so the whole model lives or dies on delivery cost per order.
What is different about Kuwait
A small, dense, high-income market where delivery is quick and word of mouth moves faster than advertising.
Local payment habits favour cards and instant transfer.
What is different about a grocery or food store
Discounting to grow trains people to wait for the discount. It works once.
Where a mobile app comes into it
Weekly reordering is the behaviour, and an app that remembers the last basket removes most of the work.