cung và cầu sản phẩm X trên thị trường được cho bơi P=60+2QS và P=960-4QD .Nếu chính phủ đặt giá trần là 300 nghìn đồng /sp và cung cấp toàn bộ phần thiếu hụt thì giá và sản lượng trao đổi thuẹc tế trên thị trường là bao nhiêu ? Thặng dư tiêu dùng thay đổi như thế nào ?Vẽ biểu đồ minh họa?

Self-interest achieve society’s economic goals because producers know which goods consumers want the most. as consumers and producers exercise their freedom to act in their own self-interest, markets will produce the desired goods at the lowest possible cost. consumers and producers both operate based on society’s economic goals. consumers know which goods can be produced at the lowest cost. there is a wide variety of desired goods and services in a market system because producers determine what to produce. consumers change their minds frequently. there is always a need to produce something new and improved. individual wants are diverse. what is produced is ultimately determined by consumers, because if the goods offered are not what consumers want, consumers will not buy them. producers, because they are driven by profits. producers, because they determine what to produce. consumers, because they participate in marketing surveys.