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Comment by danans | Hacker News Reader

> Whether it's worth it depends on interest rates, not on how long your investors live.

We had near zero interest rates for years, but I didn't see any private investors making infrastructure investments that wouldn't possibly produce a return for 50 years.

> In addition, you have lots of uncertainty: overbuilding the infrastructure in this way only takes care of exactly this one contingency, but there's plenty of other reasons why you might want to replace your pylons.

Practically I think that's the real reason. Nobody has a crystal ball to to tell them what tech will be a good investment in 50 years. It's anyone's guess, and no interest rate will allow that kind of private investment.

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> We had near zero interest rates for years, but I didn't see any private investors making infrastructure investments that wouldn't possibly produce a return for 50 years.

We had short term near zero interest rates (and even below zero real interest rates), but that doesn't mean that long term interest were that low. See eg https://fred.stlouisfed.org/graph/?g=1jVdN or https://fred.stlouisfed.org/graph/?g=1jVe8 for the inflation adjusted one. Those are interest rates that the US government is paying on 30 year bonds. Private issuers typically pay more. (I picked 30 years, because that's the longest duration the US typically borrows at.)

> It's anyone's guess, and no interest rate will allow that kind of private investment.

If you can lock in a zero or negative interest rate now, it might still be a good investment.

> If you can lock in a zero or negative interest rate now, it might still be a good investment

In the real world, what lending entity is going to offer you financing at <= 0% for 30 years?

Just because 30 year Treasury yields fell below zero from 2020-2022 didn't mean I can get that kind of financing for a project.

Yes, hence the counterfactual 'if'. This is in stark contrast to https://news.ycombinator.com/item?id=39999794 which mentioned: "We had near zero interest rates for years, but I didn't see any private investors making infrastructure investments that wouldn't possibly produce a return for 50 years."

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