Under the condition of free market economy, it is easy for merchants to sell things at sky-high prices (this is the freedom of sellers), while buyers have to bargain hard (this is also the freedom of buyers). The so-called "asking for money all over the sky, paying back on the spot" or "asking for money all over the sky, paying back on the ground". These two prices seem to be one in the sky and one on the ground, which is very different. Also pay a sky-high asking price and pay back the money on the ground.

From the perspective of value theory, the value of goods is measured. According to Marx's labor theory of value, the value of any commodity lies in its condensation and human labor, and exchange cannot change the intrinsic value of the commodity. However, in the process of value realization, in order to obtain higher monetary price, the seller uses the contradiction between supply and demand, the existence of imported goods, non-renewable and other factors to obtain higher monetary income. This phenomenon will happen more often when the supply of goods is in short supply. Such as masks during SARS, Radix Isatidis during bird flu, and iodized salt during the earthquake in Japan. Of course, the most obvious thing is the real estate industry in recent years.

In all countries of the world, monopoly industries are special cases of sitting on the ground and starting at a price. This monopoly industry relies not on non-renewable resources, but on the entry barriers of a certain industry or the support of the government to obtain "huge profits", and buyers have almost no bargaining power, so countries around the world are still cautious about monopoly.

This phenomenon is not uncommon in the entertainment circle, and the appearance fee is a starting price. When stars have a certain number of "fans", they will have a certain appeal among this group of people, and if merchants choose them as spokespersons, they will have to pay the endorsement fee, which is a kind of "price", which stems from their influence on specific groups or "emotional monopoly". If the merchants charge exorbitant prices, we will sit on the ground and make a counter-offer. Merchants charge fees indiscriminately, but customers are calm and have the idea of bargaining. Sitting on the ground now refers to the seller's extortion in disguise.

Real estate starts from sitting on the ground, taking advantage of the characteristics of land resources and holding the land in your hand, literally starting from sitting on the ground.

Futures in modern commerce are designed for this kind of behavior. The two sides first agree on the price and trade at the specified price on the specified date. As a result, the modern futures market came into being, and options came into being.