Indian talk

A man is driving toward home in Northern Arizona when he comes upon a Navajo man hitchhiking. Because the trip has been long and quiet, he stops the car and the Navajo man climbs in. During their small talk, the Navajo man glances surreptitiously at a brown bag on the front seat between them.
"If you're wondering what's in the bag," offers the man, "it's a bottle of wine. I got it for my wife."
The Navajo man is silent for a while, nods several times and says, "Good trade."