11.   At virtually all of these places, prices fluctuate seasonally with demand.

12.   Because energy and food prices fluctuate rapidly, many economists prefer the so-called core rate, which eliminates these items.

13.   Best said she bought and sold bonds this week as prices fluctuated with the stock market.

14.   Bidding on established time-sensitive services such as airline tickets and hotel space, where prices can fluctuate based on demand and availability, is catching on.

15.   Bond prices fluctuate based on prevailing interest rates.

16.   Bonds prices fluctuated throughout as traders tried to beef up the books ahead of tomorrow, the last day of the fiscal half year.

17.   Bonds prices fluctuated throughout the day as traders tried to beef up the books ahead of tomorrow, the last day of the fiscal half year.

18.   Air-fare prices can fluctuate from day to day, largely because airlines use sophisticated yield-management techniques to track sales and adjust prices.

19.   But as the prices of goods fluctuate, the cost of a European vacation may well change in the next couple of years.

20.   But in the deregulated market, where prices fluctuate constantly, companies knew that if they overinvested, prices and profits would plunge.