In the housewives' assault on the high cost of food, one item at the check-out counter has become a highly visible target: trading stamps. Trouble for the $1-billion-a-year industry is coming from all directions.
The Federal Trade Commission has begun an investigation of the role stamps as well as their trickier cousins, prizegiving promotional games play in food prices. California's Governor Pat Brown last week promised to help the F.T.C. by sending along a new state wide study that, he says, indicates that the gimmicks cost shoppers "at least a week's groceries a year." New York City Commissioner...