by Michael Roberts
William J. Baumol, who died last week at the age of 95, was one
of the pre-eminent mainstream economists of his generation. He taught
for more than 40 years at Princeton University and at New York
University, where he retired in 2014. His work touched on monetary
policy, corporate finance, welfare economics, resource allocation and
entrepreneurship, but he was best known for the principle that came to
bear his name: Baumol’s ‘cost disease’.
Baumol’s cost disease is the idea that personally delivered services —
musical performances, medical care, education and garbage collection,
for example — naturally and inevitably increase in price year after
year. Improved technology may allow bagels and cars to be produced more
efficiently and therefore more cost effectively, but, as Baumol famously
observed, a Mozart string quartet requires today the services of four
musicians, the same manpower it took in the 18th century. This idea had immediate relevance in public policy, particularly in
the areas of health care and education, because it showed why important
public services could not be measured for cost-effectiveness in the same
way as manufacturing in the capitalist sector. They provided services
for need, not profit.
“The critical point here is that because politicians do not
understand the mechanism and nature of the cost disease, and because
they face political pressures from a similarly uninformed electorate,
they do not realize that we can indeed afford these services without
forcing society to undergo unnecessary cuts, restrictions and other
forms of deprivation,” he wrote in his 2012 book The Cost Disease. It is a matter of public choice not ‘efficiency’.
Baumol was prolific in his economic research, particularly in looking
at the role of ‘entrepreneur’ as innovator rather than as capitalist.
He also produced one of the main mathematical economics textbooks of the 1960 and 1970s – it was pretty dry, as I remember.
Baumol was a liberal. He advised Hillary Clinton and various
Democrat leaders and was strong advocate of public healthcare and
education. And he was a trustee for Economists for Peace and Security, a
liberal UN body of economists opposed to nuclear weapons, along with Kenneth Arrow (who has also recently died) and JK Galbraith.
But what is less known is that in the early 1970s Baumol engaged in a mainstream debate with leading Keynesian Paul Samuelson
on the validity and purpose of Marx’s value theory. Samuelson had
launched an attack on Marx’s theory as it began to gain some traction
among student activists in those revolutionary days ((Paul A.
Samuelson’s “Understanding the Marxian Notion of Exploitation: A Summary
of the So-called Transformation Problem between Marxian Values and
Competitive Prices, “J. Econ. Lit., June 1971, 9 (2), pp. 399-431).
Like Eugene Bohm-Bawerk tried to do in the late 1890s,
and like Keynes in the 1930s, Samuelson wanted to expose the fallacies
of Marx’s theory in case economics students became infected with
Marxism. Keynes called Marx’s value theory “scientifically erroneous and without application to the modern world’ (Keynes,
Laissez-Faire and Communism, quoted in Hunt 1979: 377). Samuelson’s
approach was to argue, not that Marx’s value theory was illogical
because values when measured in labour time could not equal prices
measured in markets (as Bohm-Bawerk claimed), but that his theory of
value was irrelevant to an explanation of the movement of market prices and therefore to any understanding of modern economies.
Samuelson argued that Marx’s ‘transformation’ of labour values into
prices of production was unnecessary. Market prices are explained by
the movement of supply and demand, so what need of a value theory?
Indeed, it could be erased. “The truth has now been laid bare.
Stripped of logical complication and confusion, anybody’s method of
solving the famous transformation problem is seen to involve returning
from an unnecessary detour… such a transformation is precisely like that
which an eraser is used to rub out an earlier entry (i.e. value – MR) after which we make a new start to end up with a properly calculated entry (i.e. price – MR)”.
Well, Baumol carefully took Samuelson to task in his essay, The transformation of values: what Marx really meant. In
so doing, he made an important contribution in explaining and
validating Marx’s theory of value. Baumol points out that Samuelson,
along with post-Keynesian Marxists like Joan Robinson, misunderstood
Marx’s purpose in the so-called transformation of values into prices.
Marx did not want to show that market prices were related directly to
values measured in labour time. “Marx did not intend his transformation analysis to show how prices can be deduced from values”.
The aim was to show that capitalism was a mode of production for profit
and profits came from the exploitation of labour; but this fact was
obscured by the market where things seemed to be exchanged on the basis
of an equality of supply and demand. Profit first comes from the
exploitation of labour and then is redistributed (transformed) among the
branches of capital through competition and the market into prices of
For Marx, that only labour creates value is self-evident. “Every
child knows that any nation that stopped working, not for a year, but
let us say, just for a few weeks, would perish…. This constitutes the
economic laws of all societies, including capitalism. And every child
knows, too, that the amounts of products corresponding to the differing
amounts of needs, demand differing and quantitatively determined amounts
of society’s aggregate labour”, Letter from Marx to Kugelmann, 11 July 1868, MECW, , .
Total surplus value is produced from exploitation of work forces
employed by various capitalists – the difference in value measured in
labour time between that time needed for the wages of the labour force
and the price of the commodity or service produced realised in the
market place for the capitalist. But not the surplus value or profit
achieved by each capitalist’s workforce does not go directly to the
individual capitalist. Each capitalist competes in the market to sell
its commodities. And that competition leads to profits being
redistributed because profits tend to an average rate per unit of
The transformation of values created by labour into prices in the
market means that individual prices will differ from individual values.
As Baumol says, Marx knew that individual prices of production differed
from individual values; unlike Ricardo who could not solve this
transformation. So total surplus value is converted (transformed) into total profit,
interest and rent, with the market deciding how much for each
capitalist. Yes, ‘supply and demand’ decides profit or loss for an
individual capitalist. But that is just the appearance or result of the
distribution of profit through market competition but created by the
overall exploitation of labour in the production process.
Baumol’s explanation was a starting point for a more comprehensive
answer and defence of Marx’s value theory developed by Marxist scholars
like Carchedi, Yaffe, Kliman, Freeman, Moseley and others over the last 40 years since Samuelson’s attack.
Baumol’s interpretation of Marx’s theory provides a powerful answer
not only to Samuelson but also to the ‘standard interpretation’ of the
transformation problem, as Fred Moseley has named it in his book, Money and Totality
(a book that explains in detail all the theoretical issues raised by
mainstream and other heterodox economists and answers them).
Values in a commodity do not have to be ‘transformed’ into prices, as
Robinson and Samuelson interpret Marx’s theory. Prices are the
appearance in the market of the exploitation of labour in production
process. As Fred Moseley says, if you accept Samuelson’s interpretation
of Marx’s transformation of values into prices then “values do in fact cancel out and play no role in the determination of prices” (p229). However, this is not Marx’s theory. Individual values are not converted into individual prices of production: “individual values play no role in Marx’s theory of prices. What happens is that “total new
value produced by current labour … is determined (in part) by the total
surplus value produced, which in turn (in part) determines the general
rate of profit and ultimately, prices of production… prices of
production are not determined by multiplying transformation coefficients
for each commodity by the individual values, but by adding the average
profit to given money costs”.
There is no need to transform the values of constant capital
(machinery etc) and variable capital (labour power/workforce) into
prices. They are already given as prices from the market in the previous process of production. The only transformation that takes place is the transformation of the total new
value from the production process in a re-distribution through market
competition, with profits going to the various capitalists depending on
the size of capital each advanced at the start of production.
As Baumol says, the distribution of surplus value from society’s
central storehouse now takes place via the competitive process which
assigns to each capital profits (or interest or rent) an amount strictly
proportional to its capital investment. “This is the heart of the
transformation process – the conversion of surplus value into profit,
interest and rent. It takes from each according to its workforce and
returns to each according to its total investment” p53
Marx’s transformation is temporal: you start (t1) with given money
capital to invest in plant, machinery and labour and you get new value
created by the exertion and exploitation of labour (t2). The surplus
value comes from after covering the cost of capital (constant and
variable). This is then redistributed through competition in the
market, which drives all towards an average rate of profit. Thus total
value (dead labour and living labour plus surplus value) still equals
total prices (based on the given cost of invested capital plus an
average rate of profit), but total surplus value is transformed into
profits, interest and rent and distributed according to the size of the
Here is Marx’s actual schema for this transformation.
You can see that total values (TV) equal total prices (TP), but
individual capitals have commodities with different values (V) to prices
(P) because of the redistribution of surplus value (s) into profits (p)
by the market. There is no transformation of constant (c) and variable
(v) capitals because they are already transformed (into money prices) in a previous production period.
Indeed, Baumol’s (and Marx’s) transformation has since been supported empirically. Carchedi
has shown that the money price average rate of profit is close to the
value average rate of profit (i.e. across a whole economy). Other
scholars have shown that when an individual sector’s production is
measured in value terms (i.e. in labour time) and then aggregated, the total value is pretty close to total prices measured in money terms. Thus Marx’s transformation of value into prices is not irrelevant even to relative price determination.
But, as Baumol said, it was not Marx’s purpose to show that. He
wanted to show that it is the exploitation of labour that creates value
(through the private appropriation of the product of labour power) and
that lies behind profit, interest and rent.
Profit is not the reward for ‘risking capital’ (money for equipment
etc); or rent from ‘providing’ land; or interest for ‘lending’ money;
thus rewards to various factors of production. Baumol comments: “Such
nonsense is precisely what Marx’ analysis anticipates and what it is
intended to expose. Again, let Marx speak for himself. “In
Capital-Profit, or better Capital-Interest, Land-Rent, Labor-Wages of
Labor, in this economic trinity expressing professedly the connection of
value and of wealth in general with their sources, we have the complete
mystification of the capitalist mode of production. …This formula
corresponds at the same time to the interests of the ruling classes, by
proclaiming the natural necessity and eternal justification of their
sources of revenue and raising them to the position of a dogma.” (Volume III, Chapter 48, pp. 966-67).
It is no accident that it is the Keynesians and post-Keynesians like
Joan Robinson that were (and are) the most vehement against Marxist
economic theory – because Marxism is the main opponent of Keynesian
influence in the labour movement.
William Baumol may have been as mainstream an economist that you
could find – an exponent of the neoclassical equilibrium and
marginalism. But he was also a surprisingly acute observer of Marx’s
exploitation theory of capitalism. As a result, he could show the
Keynesian (and neo-Ricardian) claim that Marx’s value theory was an
‘irrelevant and unnecessary detour’ was wrong. For that, we can thank
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