[Someone]

On a hundred year bond, "adjusted for inflation" can already be a nasty surprise (5% inflation a year over a century gives you about a 2^7 multiplication factor, or two zeroes)

[smallnamespace]

Why would that be a nasty surprise? The real value is unchanged. Unless you're saying the adjustment only happens at renewal, and not annually?

[akvadrako]

Often that's the case and in some countries you typically owe the whole value for the next 40 years when it's renewed. Of course it could be absorbed in the mortgage.