That's right. This phenomenon was first discovered in Ireland. It's an effect in economics, like Ji Fen. But I still remember the principle that not all low-priced goods will have this situation. This commodity must have several characteristics, such as necessities of life and high public price sensitivity. For example, two meters of oil and salt is too expensive, and starvation is more troublesome. Because the price has increased, and it is expected to increase further, it is necessary to increase the purchase quantity for the consideration of rational people. In order to reduce further losses caused by future price increases. On the surface, it violates the principle of supply and demand, but in the long run, it follows this principle. Cheap food hurts farmers, which is an opposite example.

Oil prices continue to rise, and people who have cars, taxi drivers or enterprises that need a lot of oil in the process of production and operation, if they don't want to take it and can afford it, buy more and save more when conditions and policies permit.

Houses and gold mines are speculative, but the public should start from their own considerations, not just from China, otherwise there would be no stock market crashes in tulip bubble and London, the world economic crisis in the early 20th century, the Japanese real estate bubble and the American high-tech stock market bubble. The state controls grain and oil in order to avoid the irrational economic situation caused by this rational expectation, especially to prevent those who profit from it from being attacked and ensure economic stability and the normal life of the public.

Jia Xu's commodities are commodities whose quantity and price change in the same direction.

Ji Fen, an Englishman, discovered in the19th century that there was a famine in Ireland in 1845, and the price of potatoes rose, but the demand for potatoes actually increased. At that time, this phenomenon was called the "Ji Fen puzzle". This special commodity whose demand and price change in the same direction is also called Giffin commodity.

The particularity of Jia Xu commodity lies in its income effect exceeding substitution effect. This is the special reason why Giffin's commodity demand curve inclines to the upper right.

Giffin commodity, a term in economics, refers to a commodity whose demand will increase if the price of a commodity rises, while other factors remain unchanged. Some scholars believe that there is no "Giffin commodity" in the world. I think there is "Jia Xu commodity" or "Ji Fen phenomenon", but I don't think it violates the law of demand. Mr Wang Dingding and Mr Huang Youguang regard "fact" as "theory".

Since 200 1, economists in China have been arguing about the law of demand (or law of demand). It is rare for so many scholars to participate in the war, to discuss for a long time and to have a wide range of influence. So far, the dispute has been fruitless. For readers or economists, it is still at a loss: is the demand curve necessarily inclined to the lower right corner? Are there "Jia Xu goods" in the world?

Zhang Wuchang and others insist that the demand curve must be downward, and there is no "giffen commodity" in the real world. Huang Youguang, Wang Dingding and others believe that there is an upward sloping demand curve and a kind of "giffen commodity".

The existence of "Jia Xu commodity" has always been an unsolved problem in economics. Even in American academic circles, there has always been a debate. For example, the Chinese translation of "Confusion and Paradox of Economics" published by Huaxia Publishing House 200 1 has a special article to discuss this issue, but there is no conclusion so far. In the current economics textbooks at home and abroad, "Jia Xu commodity" exists as an exception to the law of demand.