31.   One popular style has been arbitrage, in which managers exploit price differences of similar securities, like a stock and its options.

32.   One reason for that price difference is that laptops cost more to manufacture.

33.   One trick was to sometimes squeeze profits from the minor price differences between zero-coupon bonds and regular government bonds.

34.   Owners can also recoup the price difference in savings on gasoline and lower maintenance costs.

35.   One possible explanation for this price difference is that New York is a much bigger city with more affluent fans competing for seats.

36.   Part of the price difference is attributable to the type of gasoline being used.

37.   Regional price differences often dictate where surplus oil cargoes will be sent as traders attempt to secure the highest price.

38.   Several years ago, there was a price difference favoring Prizm over Corolla, but not anymore.

39.   So, if employees opt for brand-name drugs once generics are available, they must pay the price difference.

40.   Sue Swanson, president of Cellular One, said competition will quickly wash out most price differences.