def METHOD_NAME(model):
    production_costs = sum([model.SetupCosts[i] * model.ProduceSizeSecondStage[i] + \
                           model.UnitProductionCosts[i] * model.NumProducedSecondStage[i] \
                           for i in model.ProductSizes])
    cut_costs = sum([model.UnitReductionCost * model.NumUnitsCutSecondStage[i,j] \
                    for (i,j) in model.NumUnitsCutDomain if i != j])
    return (model.SecondStageCost - production_costs - cut_costs) == 0.0