What is a gift economy?

What if, this holiday season, instead of saying "thank you" to your aunt for her gift of a knitted sweater, the polite response expected from you was to show up at her house in a week with a better gift? Or to vote for her in the town election? Or let her adopt your firstborn child? Alex Gendler explains how all of these things might not sound so strange if you were involved in a gift economy. [Directed by Avi Ofer, narrated by Pen-Pen Chen].