The logic behind Kadogo is not low prices. It is convenience of purchase; and for that, slum dwellers are willing to pay the premium.
You see, this is a person who cannot afford, say to drink tea every day because hi income is very erratic.... some days he gets work and gets money, other days he doesn't.
On the day he has money, it is NOT enough to buy 2kg unga + 1kg sugar + 500g blue band + 500g Kasuku + .... +.... that you can get from the supermarket!
But he can buy 20bob unga +5bob sugar + 5bob blue band + 10bob Kasuku etc and still have some balance.
On the days he has no work, luxuries like sugar and blue band are skipped and he buys only the basics.
He knows full well that buying Kadogo is very expensive and he lives for the day his income will stablise so that he can enjoy the savings that you enjoy at Tuskys.
Nothing is real unless it can be named; nothing has value unless it can be sold; money is worthless unless you spend it.