| Internal relationships and external alternatives | Explain both; a market premium does not itself settle equal-value or other institutional questions. |
| Contribution and controllability | Reward evidence must concern the contribution and conditions the rule actually names. |
| Incentive and cooperation | A local target can penalize helping, quality or protection that the work also requires. |
| Change and continuing obligations | A new design needs a lawful, affordable transition; a proposal does not rewrite existing entitlement. |