Based on optimistic assumptions about how a collapse might occur, we estimate that 260,000–400,000 ground force personnel would be required to stabilize North Korea. This means that even in the relatively benign scenario that we describe, the requirements for stabilizing a collapsed North Korea would outpace the combined U.S. troop commitments to Iraq and Afghanistan. Managing a more demanding Korean collapse scenario would push these requirements higher or lengthen the duration of the operation, or possibly both.
Alex Lundry and I have a new post up at Model Politics. In a YouGov survey from last week, we included an experiment. After GOP voters had been asked which candidate they supported in the primary, we randomly assigned them to see Intrade probabilities for the GOP nomination, for the general election, or both. Then we asked them a second time which candidate they supported. The goal was to see whether knowing something about electability would change their preferences. Indeed, it did: