## Abstract

The paper proposes a post Keynesian framework to explain Tobin’s q behavior in the long run. The theoretical basis is informed by the Cambridge corporate model originally proposed by Kaldor (1966 ———. “Marginal Productivity and the Macro-Economic Theories of Distribution.” Review of Economic Studies, 1966, 33, 309–319.

[Crossref], [Web of Science ®], [Google Scholar]

), which is reinterpreted here as a theory for q. The core of the “Kaldorian q theory” is a negative long-run relation between q and growth rates, a negative relation between q and propensities to consume, and the fact that q can be different from 1 in the long-run equilibrium. We generalize this model through a medium-scale stock-flow consistent (SFC) model, which introduces important post Keynesian aspects missing in the Kaldorian model, such as endogenous money, a financial system, and inflation. We extend the model to include a more realistic treatment of firms’ financial structure decisions and allow the interdependence between these decisions and dividend policy. Numerical simulations confirm that the original Kaldorian relations between q and growth rates and propensities to consume hold, but unlike the original model, in our model, q is not independent of how firms finance their investment. We also confirm the possibility of q being different from 1 in the long run. Finally, we contrast this “post Keynesian q theory” with the Miller–Modigliani dividend irrelevance proposition and the neoclassical investment and financial theory. It is shown that its validity depends crucially on the value taken by q: for q values different from 1 the proposition will not hold and dividend policy will be relevant for equity valuation. Therefore, post Keynesian q theory stands against the main predictions of mainstream finance and constitutes an alternative for developing a macroeconomic theory for equity markets.

[Crossref], [Web of Science ®], [Google Scholar]

), which is reinterpreted here as a theory for q. The core of the “Kaldorian q theory” is a negative long-run relation between q and growth rates, a negative relation between q and propensities to consume, and the fact that q can be different from 1 in the long-run equilibrium. We generalize this model through a medium-scale stock-flow consistent (SFC) model, which introduces important post Keynesian aspects missing in the Kaldorian model, such as endogenous money, a financial system, and inflation. We extend the model to include a more realistic treatment of firms’ financial structure decisions and allow the interdependence between these decisions and dividend policy. Numerical simulations confirm that the original Kaldorian relations between q and growth rates and propensities to consume hold, but unlike the original model, in our model, q is not independent of how firms finance their investment. We also confirm the possibility of q being different from 1 in the long run. Finally, we contrast this “post Keynesian q theory” with the Miller–Modigliani dividend irrelevance proposition and the neoclassical investment and financial theory. It is shown that its validity depends crucially on the value taken by q: for q values different from 1 the proposition will not hold and dividend policy will be relevant for equity valuation. Therefore, post Keynesian q theory stands against the main predictions of mainstream finance and constitutes an alternative for developing a macroeconomic theory for equity markets.

Original language | English |
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Pages (from-to) | 190-204 |

Number of pages | 15 |

Journal | JOURNAL OF POST KEYNESIAN ECONOMICS |

Volume | 28 |

Issue number | 2 |

Early online date | 11 Aug 2016 |

Publication status | Published - 2016 |