Dave and Marlene Carter live in the Boston area, where Dave has a succesful othodontics practice.

Dave and Marlene Carter live in the Boston area, where Dave has a succesful othodontics practice. Dave and Marlene have built up a sizable investment portfolio and have always had a major portion of their investments in fixed-income securities. They adhere to a fairly aggressive investment posture and actively go after both attractive current income and substantial capital gains. Assume that it is now 2010 and Marlene is currently evaluating two investment decisions: One involves an addition to their portfolio, the other a revision to it.The Carter's first investment decision involves a short-term trading opportunity. In particular, Marlene has a chance to buy a 7.5%, 25-year bond that is currently priced at $852 to yield 9%; she feels that in two years the promised yield of the issue should drop to 8%.The second is a bond swap. The Carters hold some Beta Corporation 7%, 2023 bonds that are currently priced at $785. They want to improve both current income and yield-to-maturity, and are considering one of three issues as a possible swap candidate: (a) Dental Floss, Inc., 7.5%, 2035, currently priced at $780; (b) Root Canal Products of America, 6.5%, 2023, selling at $885; and (c) Kansas City Dental Insurance, 8%, 2024, priced at $9.50. All of the swap candidates are of comparable quality and have comparable issue characteristics.a. Regarding the short-term trading opportunity:1.What basic trading principle is involved in this situation?