<p>No, things wouldn’t change. The thing that differentiates a per-unit subsidy from a lump sum subsidy is that a per-unit subsidy changes MR/MC while a lump sum does not. Just because a lump sum subsidy is offered annually doesn’t mean it is similar to a per-unit subsidy; the total subsidy of a per-unit subsidy varies with output while a lump-sum is fixed.</p>