If the manufacturer actually produces moon cakes, the production cost is 40 yuan. If the moon cakes are finally returned to the manufacturer and the moon cakes are not sold this year, then the GDP generated by the production of moon cakes is the production cost 40 yuan of the manufacturer, and the moon cakes are circulated without production.
Of course, another purpose of mooncake coupons is to exchange mooncakes. For example, A takes a mooncake coupon and asks the manufacturer to change mooncakes. What is the GDP at this time?
Ha, it's still 40 yuan, because the mooncakes are not circulated all the time, so the mooncakes of the manufacturers are always the final products. The whole circulation process of mooncake coupons is the circulation process of mooncake coupons. You can treat mooncake coupons as stocks.
The circulation process of moon cake coupons is the circulation process of stocks. The book value and face value of listed companies are different, but the real value of the company can only be reflected in the book. Similarly, the face value of mooncake coupons is also virtual, and the real GDP is the circulation process of mooncakes.