TY - JOUR

T1 - The Dixit–Stiglitz economy with a 'small group’ of firms

T2 - a simple and robust equilibrium markup formula

AU - d'Aspremont, Claude

AU - Ferreira, Rodolphe dos Santos

PY - 2017/12

Y1 - 2017/12

N2 - In a general version of Dixit–Stiglitz two-sector economy, we present three variants of the concept of oligopolistic equilibrium in price-quantity pairs (d'Aspremont and Dos Santos Ferreira, 2016) integrating income feedback effects in three different ways. For the first two variants (Ford effects ignored or restricted to profits), a single and simple equilibrium markup formula is derived involving, for each firm, a conduct parameter indicating its degree of competitive toughness. Different specifications of these conduct parameters lead to different oligopolistic equilibria in prices and/or in quantities. In particular in the standard Dixit–Stiglitz economy, we show, that the first order conditions of a symmetric oligopolistic price equilibrium correspond to a unique degree of competitive toughness in the general markup formula, This degree is decreasing (and the markup increasing) as more feedback effects are taken into account by firms. On the contrary, for the third variant, introducing full Ford effects leads to lower markups and higher competitive toughness in the standard Dixit–Stiglitz economy and under conditions ensuring the equilibrium markup to remain in tne right interval,

AB - In a general version of Dixit–Stiglitz two-sector economy, we present three variants of the concept of oligopolistic equilibrium in price-quantity pairs (d'Aspremont and Dos Santos Ferreira, 2016) integrating income feedback effects in three different ways. For the first two variants (Ford effects ignored or restricted to profits), a single and simple equilibrium markup formula is derived involving, for each firm, a conduct parameter indicating its degree of competitive toughness. Different specifications of these conduct parameters lead to different oligopolistic equilibria in prices and/or in quantities. In particular in the standard Dixit–Stiglitz economy, we show, that the first order conditions of a symmetric oligopolistic price equilibrium correspond to a unique degree of competitive toughness in the general markup formula, This degree is decreasing (and the markup increasing) as more feedback effects are taken into account by firms. On the contrary, for the third variant, introducing full Ford effects leads to lower markups and higher competitive toughness in the standard Dixit–Stiglitz economy and under conditions ensuring the equilibrium markup to remain in tne right interval,

UR - http://www.scopus.com/inward/record.url?scp=85031493708&partnerID=8YFLogxK

U2 - 10.1016/j.rie.2017.10.007

DO - 10.1016/j.rie.2017.10.007

M3 - Article

AN - SCOPUS:85031493708

VL - 71

SP - 729

EP - 739

JO - Research in Economics

JF - Research in Economics

SN - 1090-9443

IS - 4

ER -