G. L. S. Shackle, Keynesian Kaleidics (1974)

Shackle reads Keynes’s Treatise on Money and General Theory as one unfinished attempt to make economics adequate to uncertainty. Keynes’s deepest discovery, in this interpretation, was that a monetary economy cannot be understood as if agents possessed complete knowledge of future outcomes. Yet Keynes often expressed that discovery in the language of equilibrium theory, thereby muting its radical force.

The two books, then, are the same book.

The book’s central contrast is between value theory, which imagines a system of fully coordinated plans, and a money economy, where action precedes knowledge. Money matters because the future is not given: savers may remain liquid, while entrepreneurs must commit resources to specific and vulnerable capital forms. Unemployment, then, is not merely a wage-price defect. Labour cannot simply bid itself into employment, because employers hire only on conjectures about future sale proceeds and investment yields.

The future is each man’s own imaginative figment

Shackle finds the clearest methodological breakthrough in the Treatise. Keynes’s Fundamental Equations are treated not as static identities but as a rudimentary sequence analysis, viewing the same interval first from its beginning, through expectation, and then from its end, through recorded outcome. Income is therefore not just realized revenue; it is anticipated cost and normal remuneration. Profit appears when imagined and realized results diverge.

Income, in the Fundamental Equations, is a conjecture which can be wrong.

This ex ante/ex post distinction is Shackle’s main weapon against mechanical Keynesianism. Had Keynes carried it more fully into the General Theory, Shackle argues, he would have resisted the temptation to present identities as if they were equilibrium conditions. The Treatise already contains a historical theory of demand, cost, windfall profit, and adjustment, but it still lacks a satisfactory centre: a theory of investment under genuine uncertainty.

That centre is supplied, imperfectly, by the marginal efficiency of capital. Shackle regards Keynes’s investment theory as indispensable because it locates employment in entrepreneurial imagination, not in thrift or mechanical accumulation. But it is unstable because prospective yields are represented as if they were determinate numbers. Keynes’s own argument shows that such numbers rest on fragile evidence, convention, and mood. The investment demand schedule is thus not an objective social datum but a private and revisable construction.

The theory of interest undergoes a parallel transformation. From Wicksell Keynes inherited the separation between money and natural rates; in liquidity preference he radicalized it. Interest becomes a phenomenon of speculative asset markets, confidence, and the desire to postpone irreversible choice. Bulls, bears, banks, news, and fear all enter the determination of the bond price and hence the rate of interest.

This is the soul of Keynes’s theory.

Liquidity, for Shackle, is not a detachable motive but the common form of action under incomplete knowledge. Even transactions balances express a wish to defer decision until wants and opportunities are clearer. Hence the liquidity function cannot be a stable textbook curve. It shifts with interpretations of the future, and these interpretations may change suddenly.

The final lecture names this vision kaleidic. Economic life is not a movement toward permanent equilibrium, nor even a regular cycle, but a succession of temporary patterns formed by mutable expectations. Equilibria may appear, but they are precarious pauses sustained by convention. Shackle’s Keynes is therefore not the architect of hydraulic macroeconomics but a theorist of imagination, liquidity, and irreversible commitment.

Economics is the art and science of imprecision.