Karen Helene Ulltveit-Moe

Heterogeneous Firms or Heterogeneous Workers? Implications for Exporter Premiums and the Gains from Trade

We investigate to what extent worker heterogeneity explains the well-known wage and productivity exporter premiums, employing a matched employer-employee data set for Norwegian manufacturing. The wage premium falls by roughly 50% after controlling for observed and unobserved worker characteristics, while the total factor productivity premium falls by 25% to 40%, suggesting that sorting explains up to half of these premiums. Recent trade models emphasize the role of within-industry reallocation of labor in response to various shocks to the economy. Our findings suggest that aggregate productivity gains due to reallocation may be overstated if not controlling for sorting between firms and workers.

Vertical Industry Linkages: Sources Of Productivity Gains And Cumulative Causation

In this paper we analyse how vertical industry linkages maywork as channels for externalities. We test for activity based externalities stemming from outputgrowth and output level in vertically linked industries. Moreover, by comparing resultson localised inter-industry externalities as well as significance of local sales linkages,we try to reveal the strength of self-reinforcing agglomeration forces. A number of Norwegianmaritime transport and services sectors are analysed. The results are promising inthe sense that the model allows us to distinguish empirically between different sources ofexternalities, and unveils the extent to which vertical industry linkages give rise to self-reinforcingagglomeration.