For many, that zone was a "core" inflation rate - excluding volatile prices for food and energy - of 1 to 2 percent a year.

Because this has been a year of extraordinarily volatile prices, such sales have been rare.

For short-term profits, though, funds with volatile prices make more sense - however their net asset values may behave.

One way of accomplishing this is by excluding items frequently subject to volatile prices, like food and energy.

A separate consumer price index that excludes energy and other products with volatile prices was slightly more stable.

We are dealing with constraints from volatile prices resulting from structural changes in the economy.

Long-term contracts can protect consumers from volatile prices and price manipulation by suppliers.

The core inflation rate, a measure closely watched by the Fed because it excludes the volatile prices of food and energy, was also zero.

Instead it has brought wildly volatile wholesale prices and undermined the reliability of the electricity supply.

Due to the volatile prices and high capital costs few deposits can be exploited economically without subsidies.