Galtland Index

Time Preference and the Theory of Interest

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Time Preference and the Theory of Interest

Interest is not what capital “earns” because it is physically productive, nor a reward for the pain of abstinence. It is the agio — the premium — at which present goods exchange for future goods, and it exists because acting people, other things equal, value a satisfaction now above the same satisfaction later. This is the time-preference (agio) theory of interest, the Austrian answer to the oldest puzzle in the theory of capital.

The Question and the Austrian Answer

Why is there interest at all — why does a sum lent return more than was lent, and why do capital goods throw off a net return year after year? Böhm-Bawerk cleared away the standard answers in Capital and Interest — the productivity, use, abstinence, and exploitation theories — before giving his own in The Positive Theory of Capital. His answer: present goods are, as a rule, worth more than future goods of the same kind and quantity, so they trade at a premium. That persisting premium is interest (originary interest), prior to and independent of any business profit or loan contract.

“It is an empirical fact of undoubted universality that present goods are valued more highly than future goods of like kind and amount.”

— Eugen von Böhm-Bawerk, The Positive Theory of Capital

Böhm-Bawerk’s Three Grounds

Böhm-Bawerk traced the premium on present goods to three causes:

  1. Different circumstances of want. People often expect to be better provided for in the future than now (or face present urgency), so a present good relieves a more keenly felt want than the same good later.
  2. Systematic underestimation of the future. Even correcting for circumstances, people tend to undervalue future wants — through defective imagination, weakness of will, and the uncertainty of life — and so discount future goods.
  3. The technical superiority of present goods. Because production is roundabout (see Capital), goods available now can be invested in time-consuming methods that yield a larger or earlier product than goods that only become available later. Present goods thus command more future product.

Together these make a present good worth more than a future one; competition turns that difference into the market rate of interest.

The Misesian Revision

Mises accepted the core but pruned it. He argued the third ground — technical superiority — is not an independent cause: the higher physical yield of roundabout methods only matters because the future product is itself discounted, so the third ground collapses into time preference. On the Misesian account, restated by Rothbard, interest rests on pure time preference alone: it is a category of human action, present in every choice between sooner and later, not a price paid to a factor called capital. This is why, in the Austrian system, the interest rate is a price of time, set in the market for present-against-future goods, and why capital goods earn a return without capital being an independent productive power.

Why It Matters

Time preference is the hinge between capital theory and the business cycle. If the interest rate expresses the community’s real willingness to trade present for future consumption, then it coordinates the time-structure of production with people’s actual saving. When credit expansion pushes the money rate below that time-preference rate, the signal is falsified and the structure of production is lengthened past what saving can sustain — the mechanism of Austrian Business Cycle Theory. Because the whole argument is deduced from the logic of action rather than measured, it belongs to praxeology: interest is a feature of acting in time, not an empirical regularity that could fail to hold.

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