Just re-watched Seinfeld’s The Airport episode;
Kramer: If anything, we'll probably get there early. I'll have a chance to
go to the Duty Free shop.
George: The Duty Free Shop? Duty Free is the biggest sucker deal in retail.
Do you know how much duty is?
Kramer: Duty.
George: Yeah, "duty". Do you know how much duty is?
Kramer: No, I dunno how much duty is.
George: Duty is *nothing*. It's like sales tax...
Kramer: I still like to stop at the duty free shop.
George: I like to stop at the duty free shop.
Related;
Seinfeld Classic Kramer & George – clip from The Airport
The Economics of Duty-Free Shopping
Duty Free at Baghdad International Airport
A Dilemma for Duty Free Shops
