11.   As with any collectible, prices tend to have a correlation with the rarity and aesthetic appeal of the item.

12.   Because it is is not distributed worldwide like crude oil, natural gas prices tend to respond more to regional influences and have thus stayed stronger in recent weeks.

13.   Because the Hospice de Beaune auction is a charity affair and attracts wide public attention, its prices tend to be a bit inflated.

14.   Because TWA typically matches the fares of most major competitors, the discounted Icahn prices tend to be the best in the market.

15.   Bond prices tend to move less than stock prices.

16.   Bond prices tend to rise when interest rates are falling because investors choose to lock in to fixed-returns and the threat of inflation is diminished.

17.   Bond prices tend to rise when consumer and producer prices are in check.

18.   Both earnings and dividends could rise after acquisitions or if loans are increased, and share prices tend to rise if a company buys back shares.

19.   Brazilian stock prices tend to be particularly volatile during the two weeks preceding the expiration of option contracts on Telebras.

20.   A. Summer is the peak tourist season in Iceland, and prices tend to be high.