15. Twenty-five years ago, tofu was available only from small businesses operating in predominantly Asian sections of large cities. Today tofu has become popular as a high-protein health food and is widely available in supermarkets throughout the United States. At the same time, tofu production has evolved to become factorybased using modern food-processing technologies. Draw a diagram with demand and supply curves depicting the market for tofu 25 years ago and the market for tofu today. Given the information above, what does the demand-supply model predict about changes in the volume of tofu sold in the United States between then and now? What does it predict about changes in the price of tofu? LO4