Historically, the production of many perishable foods, such as dairy products, was highly seasonal. As the supply of those products fluctuated, prices tended to fluctuate tremendously-typically by 25 to 50 percent or more- over the course of the year. One effect of mechanical refrigeration, which was commercialized on a large scale in the last decade of the nineteenth century, was that suppliers could store perishable foods from one season to the next. Economists have estimated that as a result of refrigerated storage, wholesale prices rose by roughly 10 percent during peak supply periods, while they fell by almost the same amount during the off season. Use a demand and supply graph for each season to illustrate how refrigeration affected the market for perishable food?