* Today is January 1 and we buy three bonds. * The first matures 1 year from today, the second in 2 years, the third in 3 years. * The maturity dates are the rungs of the ladder. * At the first maturity date (one year from now) a bond matures and we immediately buy a 3-year bond (recognizing that the yield may change for this new bond). * At the next maturity date we buy another 3-year bond. * etc. etc. * On January 1 of each year we always have three bonds maturing in 1, 2 and 3 years (with, usually, different yields). .... except for initial transients, the gains are associated with the longest term bonds ... because of the G3 factors which keep piling up, in Table 1. Hence, although we always have bonds maturing in 1, 2 and 3 years, our gains are more and more associated with the longest term bonds.
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