Public schools are on a decades-long hiring spree, but little is known about what’s driving this trend. With K–12 enrollment down by about 1.4 million students since the start of Covid-19 and projected to fall by another 2.5 million students by 2032, it’s critical for policymakers to understand why public schools are adding staff to their payrolls as they make decisions about funding, school closures, and efforts to improve stagnant student outc…