For each scenario, please decide whether there will be an increase or decrease in short-run aggregate supply or if there will be no change. Macmillan Learning a. Changes in the healthcare market cause employers to b. The price of lumber, a commodity, rises drastically pay significantly more for health insurance they provide due to the effect of heavy winter weather in the employees. American Northwest, where much of the world's lumber is grown. c. The production of a new type of blade for their combine harvesters, a tractor used to harvest crops, has allowed wheat farmers, like Herbert, to increase productivity by 40%