"cool down prices" is correct and usable in written English.
You can use it to describe when prices are decreasing, for example, "Due to competition between sellers, the prices of this product have cooled down in the market."
A net $60 billion was invested in American equity mutual funds in January, beating the previous record, which as it happens was set in February 2000, just before the stockmarket peaked.Foaming asset prices are reviving the debate about whether the Federal Reserve should raise interest rates to cool down asset-price inflation.
In February the Forward Market Commission, the commodities market regulator, banned wheat and rice futures in a bid to cool down food-price inflation.
"Last week, OPEC already decided to increase production by 708,000 barrels per day, and that's enough to cool down soaring oil prices," Mr. Chavez said after the signing ceremony.
The government had been trying for the last two years to cool down real estate prices, which have been out of the reach of the common people.
Analysts have said the sell-off was most likely a temporary correction to cool down overheated markets, though prices would probably stay volatile for some time.
The red-hot "21st-century socialism" of Venezuela's President Hugo Chávez has been obliged to cool down by sagging world energy prices.
In March, China raised interest rates to cool down its economy, and the prices of some raw materials took a breather.
The move, partly designed to cool down the country's economic growth, sent the dollar higher and metal prices lower.
Even in the Hamptons, where prices have risen most feverishly, real estate professionals were expecting the market to cool down.
