Mrs. Robinson on the Accumulation of Capital

This file is a single-author 1958 scholarly review essay: Ludwig M. Lachmann’s critical appraisal of Joan Robinson’s The Accumulation of Capital. Its scope is not a neutral book notice but a sustained methodological and theoretical critique of Robinson’s attempt to rebuild long-run growth theory in a classical idiom.

In the literature of this decade, not otherwise remarkable for the quality of its economic writing, Mrs. Robinson’s latest book stands out as a landmark.

Lachmann begins with admiration. Robinson’s book is “rigour, lucidity and sophistication” joined to unusual candour about abstraction. Yet his central claim is that her project is not Keynesian, despite its announced “Generalisation of the General Theory,” and not Marxist, despite its title’s Luxemburgian echo. It is a revival of Ricardo: distribution, accumulation, and technique are treated through class categories and cost-of-production reasoning rather than through marginal choice.

In spite of these appearances, however, Mrs. Robinson is neither a Keynesian nor a Marxist, but a latter-day Ricardian.

The essay’s structure is clear. Section 2 reconstructs Robinson’s model: homogeneous output and labour, fixed technical coefficients, a closed economy, profits saved and wages consumed, expectations instantaneously adjusted, and a “golden age” in which accumulation, population, technical progress, wages, profits, and the capital-output ratio move coherently. Lachmann summarizes the core mechanism as the claim that capitalist accumulation tends to benefit labour unless checked by mechanisation, monopoly, or stagnation.

The essence of Mrs. Robinson’s thesis is that accumulation of capital raises real wages.

Sections 3 and 4 then turn exposition into critique. Lachmann’s key conceptual move is to isolate what he calls the “integrability condition”: Robinson must treat the capital stock as the accumulated sum of past net investment. But technical change makes this untenable. Capital goods are heterogeneous, expectations alter valuations, old equipment becomes “fossilized,” and capital gains and losses cannot be ignored merely because the model has no place for them.

The notion of a stock of capital the growth of which accompanies the growth of output is crucial to Mrs. Robinson’s analysis.

The “golden age” is therefore read as a moving-equilibrium device that tries to preserve the measurability of capital under change. Lachmann argues that this is precisely where the model fails. Robinson’s measures—productive capacity and the real-capital ratio—cannot supply an invariant unit across economies or techniques. Labour time is no solution, because labour hours themselves have changing economic significance.

Mrs. Robinson has failed to do what cannot be done.

The deepest criticism concerns progress itself. Robinson wants both realism and homogeneity: innovation, competition, diffusion, and mechanisation are admitted, but only insofar as they can be made compatible with a capital stock of “appropriate” composition. Lachmann insists that this selects from reality arbitrarily. Real progress involves experiments, failed investments, changing combinations of old and new resources, path-dependent transitions, and continuous disequilibrium.

Homogeneity and progress are at bottom incompatible with each other.

The final section makes the methodological stakes explicit. Lachmann contrasts Robinson’s classical class-aggregate analysis with the post-1871 tradition that explains market phenomena through individual plans, expectations, revisions, and choices. His objection is not merely technical but epistemological: Robinson’s workers, entrepreneurs, rentiers, and landlords are stylized collective agents, whereas actual capitalist development depends on divergent entrepreneurial judgments and the market process that coordinates them.

It is only the continuous market process which gradually brings them into consistency as knowledge spreads throughout the market.

The essay’s relevance lies in its early, sharp formulation of themes central to capital theory and Austrian economics: capital heterogeneity, the impossibility of aggregate capital measurement under change, the role of expectations, and the market as a process rather than an equilibrium state. Lachmann respects Robinson’s book as a major achievement, but concludes that her Ricardian revival cannot account for industrial progress because it suppresses the very disorder, revaluation, and entrepreneurial recombination through which progress occurs.