But the group could arguably contribute to higher prices if it chose to pare its production.

"Drive-offs may create unsafe situations on store lots, and contribute to higher prices," the company said in a statement.

The resulting drop is expected to contribute to tighter supplies and higher prices for oil around the world.

Rising population puts additional pressure on resources, especially food production, and the increased demand has contributed to higher prices.

Even some economists who think price manipulation was widespread say these other factors contributed to soaring prices.

But analysts say that this, in turn, is contributing to higher prices for those fuels.

This will contribute to higher prices and rents for existing homes and building structures.

All of these issues have contributed to prices reaching historic highs.

The turmoil in the bond market contributed to falling prices for stocks of financial service companies.

It also contributed to higher prices in American grocery stores, and exacerbated food shortages all over the world.