Summary: Schumpeter on Robinson’s Economics of Imperfect Competition (1934)

Schumpeter’s review treats Joan Robinson’s book as a major event in price theory: not merely a contribution to monopoly analysis, but a systematic attempt to make the wide terrain between perfect competition and monopoly analytically usable. His governing distinction is between perfect competition as a logical benchmark and perfect competition as a description of reality. The former remains indispensable; the latter is dangerous if treated as an approximation to actual markets.

For by virtue of those properties the theory of perfect competition still remains a useful and almost indispensable background with which to compare, and therefore by which to understand, any other situation, however far removed it may be from it.

This position lets Schumpeter avoid both anti-theoretical empiricism and naive realism. Perfect competition is valuable because of its formal properties, not because markets usually conform to it. But once its assumptions fail, its conclusions cannot simply be retained with minor qualifications.

Things look still worse as soon as we realize that the case of free competition cannot be looked upon as an approximation, and that it becomes a distortion of what it is meant to describe if its assumptions are not fulfilled exactly.

The historical problem, as Schumpeter presents it, is that nineteenth-century theory had strong limiting cases but weak intermediate analysis. Marshall and Edgeworth saw the middle ground as unstable or indeterminate. Robinson’s importance lies in helping to establish imperfect competition as a field with its own principles, rather than as a messy deviation from competitive theory.

For any science or part of a science, the first task always consists in establishing the logical autonomy of its field, or rather the conditions under which there is logical autonomy.

Schumpeter admires Robinson’s technical achievement: her use of marginal revenue, her reinterpretation of the demand curve as average revenue, her treatment of discrimination, and her effort to give monopoly-like situations determinate analytical form. He sees the book as clear, forceful, and pedagogically effective. At the same time, he resists treating it as a completed theory. Its Marshallian partial-equilibrium framework makes it powerful for firm and industry analysis, but limited for problems of general interdependence, time, money, and disequilibrium.

The review is therefore both appreciative and programmatic. Robinson has not destroyed orthodox theory; she has shown where it must be reconstructed. Once imperfect competition is admitted as normal rather than exceptional, welfare claims and policy prescriptions change. The old assumption that intervention is rarely justified becomes much harder to sustain, because departures from competitive optimality are no longer peripheral curiosities.

And if it be part of our business to advise on questions of economic policy, then this advice would in very many cases have to be the exact opposite of what it was twenty years ago.

Schumpeter’s final emphasis is forward-looking. Robinson’s work opens a new analytical field, but it also exposes unresolved issues: oligopoly, bilateral monopoly, expectations, dynamic adjustment, chronic disequilibrium, and the business cycle. The review’s deeper claim is that imperfect competition is not a special topic inside price theory; it is a pressure point forcing economics toward a broader, more dynamic theory of capitalist process.