"decrease prices" is correct and usable in written English.
You can use it when you are talking about lowering the cost of something. For example, "We need to decrease prices in order to stay competitive in the market."
The executives allege that their work adds value and they hope to do more to decrease prices.
Prior research suggests that authorized generic drugs increase competition and decrease prices, but little empirical evidence supports this conclusion.
Over time it has steadily reduced the ranks of its short-term contractors and pressured its suppliers to decrease prices.
For example, a devaluation of currency will decrease prices of the home country's exports that are purchased in the import country's currency.
"The preponderance of price increases over decreases indicates that the market power effects, which tend to increase prices, for the most part outweighed the efficiency effects, which tend to decrease prices," the report said.
This is in contrast to distributional types of changes that create win, gains, and losses i.e. where the policies that will increase prices will negatively affect consumers, whereas policies that decrease prices might hurt producers.
See R. Lal and M. Sarvary, "When and How Is the Internet Likely to Decrease Price Competition," Marketing Science 18, no. 4 (November 1999): 485-503.
The SEC regulation could decrease price leaps but at the same time scare off a lot of profiteers.
Policies that decrease price-minimisation strategies will benefit public health.
"Decreasing prices used to keep out alternative fuels.
In addition to these decreasing prices of the computer based systems make this trend more attractive.
