Why do keypad buttons on drive-up cash machines have Braille dots?
ATM producers have to make keypads with Braille dots for their walk-up machines anyway, so it is cheaper to make all machines the same way. The alternative would be to hold two separate inventories and make sure each machine went to the right destination. If the Braille dots caused trouble for sighted users, the extra expense might be justified. But they do not. Why do brides spend so much money on wedding dresses they will never wear again while grooms rent cheap tuxedos even though they will have future occasions that call for one? Most brides want to make a fashion statement, so rental companies would have to carry perhaps 40 or 50 distinctive dresses in each size. Because each garment would be rented only infrequently, the company would have to charge more than the garment’s purchase price just to cover its costs. But because grooms are willing to settle for a standard style, a rental inventory of only two or three tuxedos in each size is sufficient, enabling companies to charge on
