In the long run, once people have had time to adjust their long-term commitments, an increase insupply and a higher price level will no longer lead to expansion of quantity supplied . The forces that generate the increase in quantity supplied in the short run be present in the long run. Costs that are temporarily fixed as a result of contractual agreements will once long-term contracts expire and are renegotiated. When this happens, resource prices will product prices, which the incentive to produce.?