What Will Happen to the Pure Interest Rate If People Were Certain that the World Would End in the Near Future?

There are other elements that enter into the determination of the time-preference schedules. Suppose, for example, that people were certain that the world would end on a definite date in the near future. What would happen to time preferences and to the rate of interest? Men would then stop providing for future needs and stop investing in all processes of production longer than the shortest. Future goods would become almost valueless compared to present goods, time preferences for present goods would zoom, and the pure interest rate would rise almost to infinity. On the other hand, if people all became immortal and healthy as a result of the discovery of some new drug, time preferences would tend to be very much lower, there would be a great increase in investment, and the pure rate of interest would fall sharply.

—Murray N. Rothbard, Man, Economy, and State with Power and Market, 2nd ed. of the Scholar’s ed. (Auburn, AL: Ludwig von Mises Institute, 2009), 444.