Michael Kremer’s Nobel prize (with Duflo and Banerjee) reminded me of his important paper The O-Ring Theory of Development. I also rewatched my video on this paper from Tyler’s and my online class, Development Economics. This was from our powerpoint and iPad days so there are no fancy graphics but the video holds up! Mostly because it’s a great model with lots of interesting implications not just for development but also for the structure of the US economy. See also Jason Collins on Garett Jones’s extension of the model.