Keynes's Z function, heterogeneous output and marginal productivity

Keynes was adamant that the assumption of homogeneous outputand capital in macroeconomic theory is inadmissable. His aggregatesupply or Z function is a generalisation of Marshall's ordinarysupply function to take account of heterogeneous output, andis an essential element of the principle of effective demand.The ‘linear Z curve’ controversy can be attributedto Keynes's desire to demonstrate how his general monetary theoryof value and output encompasses the special case of Classicaltheory, including the marginal productivity theorem. The infamoussecond footnote on pages 55–6 of The General Theory canthereby be fully resolved.     

A materialist development of some recent contributions to the labour theory of value

The paper offers a novel interpretation and affirmation of theopening arguments of Capital, answering the fundamental butneglected question of why labour is the substance of value.Marx's arguments require that two philosophical threads, oftenseparated in the literature on value, be woven together. Theargument that value is the intrinsic ‘content’ makingcommodities exchangeable employs the thread of realism. Theargument that abstract labour is the emergent ‘socialsubstance’ of value employs the thread of dialectics.This interpretation develops the materialist and dialecticalphilosophy of E.V. Ilyenkov and deepens the approach to valuetheory initiated by Ben Fine.     

The stock market and investment: another look at the micro-foundations of q theory

This paper introduces a novel distinction between real q andfinancial q. The paper examines three versions of financialq developed by Brainard and Tobin, Minsky and Hayashi, respectively.These theories differ regarding the nature of stock market pricedetermination and their use of marginal productivity theory.It is shown that non-profit maximising behaviour by managersdoes not invalidate q theory. It is also shown that if managersand shareholders have different profit expectations, this leadsto an equilibrium value of q that differs from unity. Lastly,the implicit claims in q theory regarding the efficient roleof stock markets as regulators of capital accumulation are shownto depend on assumptions about stockholder behaviour.     

Marx's value forms and Hayek's rules: a reinterpretation in the light of the dichotomy between physis and nomos

This paper argues that both Marx and Hayek objected to the dichotomybetween physis and nomos, and offered concepts which integrate,or mediate between, the two. Marx's value forms and Hayek'srules aim to grasp something neither purely natural nor purelyartificial or social, but ‘socially natural’. Valueforms and rules are natural in the sense that they pre-existagents and are taken by agents as given. On the other hand,forms and rules are social in that production relations or spontaneousorder are reproduced as the unintended consequences of agents'using forms or following rules. Thus value forms and rules standas links between agents and production relations or spontaneousorder.     

On Sraffa's Standard commodity

The necessity of expressing the relative price of a commodityin terms of another commodity makes it impossible to distinguishthat part of any change that can be ascribed to the characteristicsof the commodity itself from the part of that change that isto be ascribed to the characteristics of the commodity of reference,i.e., the numéraire. Ricardo (1817) was the first topoint out this problem and the need to find an ‘invariablemeasure of value’, but he was not able to solve the problem.In 1960, Sraffa suggested using a bundle of commodities, thathe called ‘Standard commodity’, to accomplish thisfunction, claiming that it was a standard of value invariantwith respect to changes in the distribution of income. But inSraffa's book there is no explicit proof of this claim. Thisgave rise to many misunderstandings about the Standard commodityand its role as invariable measure of value. This paper proposesa proper definition of an ‘invariable measure of value’,and then proves that the Sraffa ‘Standard commodity’does fulfil the requirements of this definition.     

Macrodynamics of debt regimes, financial instability and growth

This paper develops a post-Keynesian dynamic model of capacityutilisation and growth, in which the supply of credit-moneyis endogenous and firms' debt position—and thus the financialfragility of the economy à la Hyman Minsky—is explicitlymodelled. The interest rate is set by banks as a markup overa base rate exogenously determined by the monetary authority.The banking markup varies with changes in capacity utilisation,while the debt ratio varies with changes in the rates of interest,capital accumulation and growth. Regarding dynamics, it is shownthe possibility of relating the stability properties of a systemwith the interest rate and the debt ratio as state variablesto the prevailing Minskyan regime—hedge, speculative orPonzi.