Brendan O'Donohoe of Frito-Lay talks with EconTalk host Russ Roberts about how potato chips and other salty snacks get made, distributed, and marketed. The interview follows an hour-long tour of a local supermarket where O'Donohoe showed Roberts some of the ways that chips and snacks get displayed and marketed in a modern supermarket. The conversation is a window into a world that few of us…