The archive.

Statistical agreement does not necessarily tell us which economic relationship has been measured. In this 1951 review of Lawrence R. Klein’s Economic Fluctuations in the United States, 1921–1941, G. L. S. Shackle pairs enthusiasm for econometrics with a precise account of its limits. He values its power to expose ambiguities in theory and distinguish consequential relationships from negligible ones, yet shows how a simple consumption–investment model can produce two apparently similar equations with different underlying parameters. His perspective is neither a defence of purely deductive economics nor an unqualified endorsement of empirical modelling: internal coherence is not evidence, but estimation does not guarantee structural knowledge. This short review makes the identification problem accessible while revealing why Shackle found Klein’s methodological candour as valuable as his technical achievement.

Apparently reasonable demands on collective choice can prove incompatible: this is the tension G. L. S. Shackle brings into focus in his review of Kenneth J. Arrow’s Social Choice and Individual Values. He explains why unrestricted individual preferences cannot always yield a consistent social ranking while preserving responsiveness, independence, and freedom from imposed or dictatorial outcomes. His admiration for Arrow’s symbolic methods rests on their necessity to the result, not on mathematical elegance alone. The review offers a compact route into the theorem’s conditional scope—welfare economics without interpersonal comparisons of utility—and the difficult alternatives Shackle sees it leaving open: relinquishing consistency or restricting the diversity of preferences. It also captures his conviction that rigorous proof and intelligible economic prose can reinforce one another.

Can the word 'profit' keep a precise role in economic theory once production is recognized as action stretched through time and shadowed by uncertainty? Shackle's answer is that it cannot serve as one concept, because it silently names two: the imagined inducement that draws an enterpriser into a venture and the recorded result by which the finished venture is judged. Productive services are committed long before the product's exchange value can be known, so contractual payments merely shift uncertainty onto the equity owner rather than abolishing it. Ex ante profit, on this account, is no scalar to be maximized but a configuration of hoped-for gain and feared loss, handled through focus-gain, focus-loss, and the φ-surface. To confuse that conjectural lure with its retrospective outcome, he warns, is an error bred by static, timeless thinking; the argument was spurred by J. A. Stockfisch and J. Fred Weston.

It is only in a static analysis, the description of a situation which is essentially timeless, that a single concept of ‘profit’ could ever be enough.

Twenty years after Richard Kahn's 1931 article first set the multiplier out precisely, this survey weighs what that achievement really was. Kahn's originality, Shackle argues, lay less in an unprecedented intuition than in converting a vague, politically urgent idea about public works into a usable analytical instrument, above all by asking when extra spending would raise output rather than prices. He traces three tributaries into the General Theory: Kahn's employment multiplier, Meade's ex post equality of saving and investment, and Warming's insistence that net saving cannot exist without the investment that generates it. Yet the elementary geometric series, he cautions, conceals problems of aggregation, distribution, timing, and expectation. Comparative statics cannot separate past from future or intention from outcome, which is why he sets Hicks's elegant but deliberately non-expectational trade-cycle model against his own expectation-reaction view.

This is the bare bones of the multiplier principle. Its simplicity and ‘obviousness’ are illusory.

Value theory, Shackle charges, quietly presumes perfect knowledge — that the buyer can see every satisfaction in advance — a fiction exposed by the very existence of information, a good worth having only because its contents are not yet known. The essay accordingly shifts the object of economic choice from satisfactions to actions whose consequences remain hypothetical. Each rival hypothesis carries a face-value, the gain or loss if it proves true, and a second variable measuring its claim on the imagination; numerical probability, he demonstrates through five separate objections, cannot serve as that second variable for unique, non-seriable decisions. His replacement is potential surprise: not a lesser degree of certainty but a positive recognition of some disabling incongruity, a scale on which any number of mutually exclusive hypotheses may all sit at zero.

But the theory of consumer’s behaviour assumes that we always know what we are going to get.

Joan Robinson appears in Shackle’s 1953 review as both an iconoclast and a pillar of Cambridge orthodoxy. That tension gives his appraisal its focus: intellectual independence need not mean abandoning the traditions that make it possible. He admires Robinson’s insistence on conceptual clarity, yet asks whether her technical ingenuity sometimes makes economics difficult for the wrong reasons. Her treatment of hoarding offers a contrasting model of clarification useful to students, journalists and legislators alike. His reservations extend to political essays whose moral contrasts he finds too stark. This short review lets readers encounter Shackle’s standards of economic argument through a judgement that distinguishes theoretical achievement from the difficulties of exposition and polemic.

Twentieth-century economics did not merely add topics to an old canon; it replaced the image of a system tending toward stable equilibrium with one shaped by uncertainty, hesitation, and breakdown. Out of that upheaval Shackle draws a map, sorting inherited doctrine by the kind of time and knowledge each theory assumes: perfect adjustment, calculable dynamics, aggregative comparative statics, and the economics of uncertain expectation. The organizing question is temporal—whether a model treats time as timeless adjustment, a dated sequence, or agents' conjectures about futures that cannot be known. Keynes straddles the categories, formally comparative statics yet substantively a theory of imagined futures. The chart doubles as a proposed curriculum and as a warning against teaching incompatible assumptions as though they belonged to one unified doctrine.

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

May an economist honorably use a theory he does not fully believe? Shackle answers that the alternative would abolish the discipline, since every usable theory remains partial, contestable, and interesting precisely because it is not final knowledge. Sincerity thus becomes disciplined awareness of a theory's limits rather than abstention from theory. The essay runs a sequence of tests—on the arbitrary boundaries that wall economics off from psychology and politics, on the incompatible pictures rival abstractions paint, on equilibrium as a mechanical borrowing, on econometrics and its dangerous phrase 'incomplete information.' Because its subject matter learns, imagines, and invents, economics can never treat fitted equations as eternal truths, and its practitioners, Shackle urges, should form an open craft rather than a guarded mystery.

Economics is not physics, it is psychics, the study of men with all their capacity for learning and experimenting and inventing and imagining.

The entrepreneur who sinks his fortune into a single plant makes a choice no lottery can model — and it is mathematical expectation, the workhorse of investment appraisal, that Shackle attacks in this sequel. Multiplying outcomes by probabilities and summing them, he argues, is legitimate only where an experiment is divisible or seriable, so that a spread of results can be possessed as a statistical aggregate; one business commitment has no such structure. The textbook urn and the game of chance are closed worlds that bar by rule the very unknowns constituting reality. In their place stand focus-values — the strongest gain one can plausibly hope for and the gravest loss one must plausibly fear — standardized on a gambler's indifference map, where a steeper feared loss demands a larger promised gain. The framework recasts Kalecki's principle of increasing risk without objective probability.

When the course of action is a non-divisible non-seriable experiment, such an additive procedure loses entirely the relevance it has for a divisible experiment, and has only one claim to fall back on: that of being a compromise.

'Profit,' Shackle observes, names two quite distinct things: the realized figure an accountant records and the forward-looking conjecture that induces an enterpriser to commit resources at all. Because production takes time, those resources must be specialized before the future market is known, and it is this unavoidable uncertainty that creates the enterpriser's double role as decision-maker and uncertainty-bearer. Written for accountants but aimed at economic theory, the essay dismisses both the rough 'best guess' and mathematical expectation, whose frequency ratios describe repeatable series but say nothing about founding a firm or building a factory. In their place stands potential surprise: ventures compared through focus-gain and focus-loss rather than a single maximized number. Timeless Walrasian equilibrium, he charges, excludes the very time, novelty, and monopoly from which profit springs.

In all production, because it takes time, there is an ineradicable uncertainty.

Business can stall not because the news is bad, but because people cannot make intelligible pictures of what might happen. In this 1953 article, Shackle approaches that economic problem through an apparent contradiction: can someone expect to be surprised? He distinguishes outcomes considered and rejected from outcomes never imagined, introducing a “residual hypothesis” to acknowledge possibilities whose details remain unspecified. A nineteenth-century physicist confronted with an electronic computer illustrates how one might anticipate an explanation while being unable to conceive its content. The economic consequence, Shackle argues, is that recognised gaps in imagination can make holding cash preferable to acting. The article offers a precise distinction between pessimism about known possibilities and hesitation before possibilities one cannot yet describe.

The complete economist, on Shackle's mischievous accounting, would need mathematics, philosophy, psychology, anthropology, history, geography, politics, prose, and practical finance all at once—an impossible portrait meant to show that no single technique defines the field. Theory, he argues, is the disciplined imaginative construction of recurrent structures; it grows rigorous not by turning algebraic but by drawing out implications and testing them against rival forms. Keynes stands as proof, since abler mathematicians produced no revolution of their own. From this breadth follows an educational program: recruit able rather than residual students, delay premature specialization, and keep mathematics the servant of economic problems. An economist, on this view, is formed by breadth disciplined into judgment—the capacity to quantify without forgetting the people economics is finally about.

Economics emphatically is about chaps.