Remark. How an allowed class changes its envelope [ftip-00LX]
Remark. How an allowed class changes its envelope [ftip-00LX]
In the restricted-envelope arm, enlarging an allowed intervention class at fixed evaluation law, cost accounting, and budget can raise its envelope and cannot lower it. A finite search over feasible interventions supplies a lower bound from the scores it attains. It certifies the supremum only if it covers every feasible intervention or is accompanied by a matching upper-bound argument.