Why booking a table may soon mean buying a ticket

Both restaurant and customer take a risk when they make a reservation. Is the table really going to be ready at 8:00? Will the party of six be a no-show? Chicago restaurateur Nick Kokonas, co-owner of elite restaurants Alinea and Next, says one way to avoid the waste of broken reservations is to sell prepaid dinner tickets. Economics correspondent Paul Solman reports on Tock, a new tech startup.