Why doesn't the price of a one-dollar lighter increase for 20 years?

There may be the following reasons why the price of a one-dollar lighter does not rise for 20 years:

1. Fierce market competition: lighters are a common commodity. The market competition is fierce, and the price difference between brands is not big, so it is difficult to raise prices.

2. The production cost is stable: the production cost of lighters is relatively low, and there is no particularly great price increase pressure.

3. Strong liquidity: lighters are a kind of consumer goods, which are relatively mobile and need to be updated frequently, so it is difficult for prices to rise.

The prices of some commodities have been stable for decades, including some necessities and daily necessities. Similar goods include:

1. Salt: As salt is a common food condiment, it is difficult for the price to rise sharply.

2. Candied fruit: Candied fruit is also a common food, and the production cost is relatively low, so the price generally does not rise sharply.

3. Black and white photos: Since black and white photography has become a part of history, the demand for black and white photos is not large and the price is relatively stable.

4. Potatoes: Potatoes are staple crops, and the production cost is relatively low, and the price will not rise sharply.

Generally speaking, commodities with stable prices generally have the following characteristics: low market competition, stable production costs, sustained consumer demand, and slow product upgrading.