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The fixed income world seems to have plenty of investors who love 100-year bonds. CalTech for example sold 100-year bonds this week at what feels like a ridiculously low yield of 4.74%.

WSJ: [CalTech] sold $350 million of debt maturing in 100 years at a record-low yield of 4.744% Tuesday, becoming the latest institute of higher education to take advantage of low borrowing costs.

Why would anyone want 100-year paper? A cynical answer is that whoever made the decision to buy such paper isn't going to be alive when the bonds mature, so it's a park-it-and-forget-it investment. But there is actually a market driven rationale for adding such investments to an institutional portfolio.

1. A number of investors have long-term liabilities, such as pensions and insurance companies. They need long duration assets to reduce their asset/liability mismatch. Clearly a 100-year bond exposes one to rising rates, but the long-term liabilities will have an offsetting effect.

2. A 100-year bond has tremendous convexity. And being long convexity is sometimes worth taking a lower yield. In fact it's equivalent to paying premium to get long gamma in options. A 100-year bond will significantly outperform a 10-year bond for example if yields compress. It will underperform but to a much lesser extent if yields rise by the same amount. Convexity gives investors a cushion against rate volatility. The chart below demonstrates just how significant that effect is for a 5% coupon 100-year vs. 10-year bond.

(Click to enlarge)

Given the demand, expect more high rated corporations and universities issuing such paper. In fact the U.S. Treasury has been exploring adding 100-year bonds to its financing arsenal. People shouldn't be surprised to see the U.S. government issuing such bonds in the near future.

Disclosure: I have no positions in any stocks mentioned, and no plans to initiate any positions within the next 72 hours.