Commentary A young man who looks like a teenager walks into a liquor store and pulls a bottle of cheap whiskey off a shelf. He puts it down at the checkout counter and pulls out his wallet. The clerk at the counter looks at him skeptically. “Can I see your ID?” he asks. “Yes,” says the young man, who instantly takes his driver’s license out of his wallet and hands it to the clerk. The driver’s license indicates to the clerk that the customer in front of him had turned 21 two months ago. He sells him the cheap whiskey. Then another young man walks into the store. He grabs a bottle of very expensive champagne and puts it on the counter. Once again, the clerk asks the young man if he has an ID. “No,” says the young man. “Then I can’t sell you this champagne,” says the clerk. …