Summary — George L. S. Shackle, “A Chart of Economic Theory”

Shackle’s essay offers a compact map of economic theory after Keynes, organizing inherited doctrines by the kind of time, knowledge, and adjustment each assumes. Its premise is that twentieth-century theory had not merely added new topics to the old canon; it had changed the image of the economy itself, from a system tending toward stable equilibrium to one shaped by uncertainty, hesitation, cumulative movement, and breakdown.

But the transformation which economic theory has undergone since 1931 or thereabouts has involved far more than a mere relegation of old-fashioned doctrines.

The essay’s organizing principle is temporal. Shackle asks whether a theory can be understood as timeless adjustment, whether it requires a dated sequence of events, or whether it depends on agents’ conjectures about futures that cannot be known. This is why expectations occupy a special place in the chart: the future that matters for choice is not simply the next part of an already determined series, but a set of imagined possibilities.

One such possible principle is to consider for each topic to what degree time and its implications are of the essence of the matter.

From this premise Shackle divides theory into major regions. The “Economics of Perfect Adjustment” includes static value, distribution, and international specialization under assumptions of full knowledge and completed adjustment. “Calculable Dynamics” studies dated systems whose future paths can be derived once coefficients and initial conditions are specified, as in mechanical cycle theory and Harrodian growth. “Aggregative Comparative Statics” compares macroeconomic positions relevant to employment, money, accounting, public finance, and international income effects. Finally, the “Economics of Uncertain Expectation” treats liquidity preference, investment, money, interest, and psychological cycle theories as matters in which conjecture is constitutive rather than incidental.

Imagined future events still form an entirely distinct category, since they do not constitute a unique series.

Shackle is not rejecting formal theory. His criticism is that different formalisms buy precision by suppressing different features of economic life. Static theory is powerful when its assumptions fit the problem; dynamic theory can be exact only where the future is mechanically calculable; Keynesian macroeconomics is indispensable but paradoxical because it uses equilibrium apparatus to analyze decisions made under uncertainty. The chart therefore works as a warning against teaching incompatible assumptions as if they belonged to one unified doctrine.

Of precise knowledge it offers too much and requires too much.

The essay’s treatment of Keynes is central. Shackle reads The General Theory as straddling categories: formally it is aggregative comparative statics, but substantively it belongs to the economics of uncertain expectation. Liquidity preference depends on an obscure future, investment on conjectural yields, and fluctuations on changes in confidence. In this sense Keynes altered not only macroeconomic policy but the philosophical status of economic explanation.

The pedagogical conclusion follows from the taxonomy. Economic theory should train students in deductive and mathematical reasoning, especially through the elegant disciplines of value and distribution theory, but it should also teach them to ask what kind of time, knowledge, and policy relevance a model presupposes. Shackle’s proposed curriculum moves from statics through employment theory, money, taxation, trade, cycles, public finance, social accounting, input-output analysis, investment, and game theory. The lasting force of the essay lies in its claim that uncertainty is not an external complication added to equilibrium economics: it changes what economic action is, because action depends on imagined futures that cannot be reduced to calculable history.