The problem
Small sales, all day, and nothing big enough to notice.
A café loses money the way a bath loses water — slowly, from several places at once, in amounts too small for anyone to raise as an issue.
OpeningThe float is whatever was left in the drawer. Nobody wrote down what it was.
All morningTwo hundred sales of eighteen to forty dirhams. A handful are rung as the wrong item, a few are not rung at all, and none of it is individually worth mentioning.
MiddayStaff drinks, a remake for a customer who was unhappy, and a tray of pastries that will not last the day. All real costs, none recorded.
CloseThe cash is counted against the till total. If it is short by twenty dirhams, it is short by twenty dirhams, and tomorrow starts again.
Month endPurchases look reasonable and takings look reasonable, and the difference between them is smaller than it should be by an amount nobody can locate.
What it actually costsTwenty dirhams a shift, twice a day, every day
None of these are individually worth chasing, which is exactly why they persist. They only become visible when the close is per person and per shift rather than per day.