The replacement problem in frictional economies: A nearequivalence result

Andreas Hornstein, Per Krusell, Giovanni L. Violante

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


We examine how technological change affects wage inequality and unemployment in a calibrated model of matching frictions in the labor market. We distinguish between two polar cases studied in the literature: a "creative destruction" economy, where new machines enter chiefly through new matches and an "upgrading" economy, where machines in existing matches are replaced by new machines. Our main results are: (i) these two economies produce very similar quantitative outcomes, and (ii) the total amount of wage inequality generated by frictions is very small. We explain these findings in light of the fact that, in the model calibrated to the US economy, both unemployment and vacancy durations are very short, i.e., the matching frictions are quantitatively minor. Hence, the equilibrium allocations of the model are remarkably close to those of a frictionless version of our economy where firms are indifferent between upgrading and creative destruction, and where every worker is paid the same market-clearing wage. These results are robust to the inclusion of machine-specific or match-specific heterogeneity into the benchmark model.

Original languageEnglish (US)
Pages (from-to)1007-1057
Number of pages51
JournalJournal of the European Economic Association
Issue number5
StatePublished - Sep 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Economics, Econometrics and Finance


Dive into the research topics of 'The replacement problem in frictional economies: A nearequivalence result'. Together they form a unique fingerprint.

Cite this