Merchandising: New Licks in the Stamp Act

Every Thursday night at 8 o'clock thousands of Minneapolis and St. Paul housewives flip on their television sets to watch a video tape of the horse races at St. Petersburg's Sunshine Park. Their object is not to collect on a $2 bet but to match the numbers of the winning horses with numbers on cards that they picked up at their local National Food supermarket. The prizes are trading stamps—1,000 for a win, 500 for a place, 100 for a show.

National Food pays off nearly 700 winners a week and collects a...

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