I learned about it on No Stupid Questions, a podcast by Stephen Dubner, the guy behind Freakonomics, and Angela Duckworth, who wrote “Grit.” I linked to Character Lab, which is/was a nonprofit by Duckworth and others at UPenn.

Katy Milkman, who coined the term temptation bundling, is a behavioral economist at Penn and often collaborates with Angela Duckworth. I also recommend Milkman’s recent book: “How to Change.”