Comment by steven04612 on Against Discount Rates · 2008-01-21T19:30:41.000Z · LW · GW

That wasn't me; I guess I'll post under this name from now on.

"There is a financial argument against the possibility time travel that was published in a journal (don't have the citation offhand): if it were possible to time-travel, interest rates would be arbitraged to zero."

I'd say this is a special case of the Fermi Paradox for Time Travel. If people can reach us from the future, where are they?