theorem damping_cancellation_J_independent
{sigma_prev delta beta_n : ℝ}
(_hs : 0 < sigma_prev) (_hb : 0 < beta_n) :
-- The welfare contribution depends on sigma_{n-1}, delta, beta_n
-- but NOT on J_n or sigma_n (the own-level parameters)
welfareContribution sigma_prev delta beta_n =
sigma_prev * delta ^ 2 / beta_n := by
rfl## Welfare with Endogenous J (merged from EntryExitWelfare.lean)