Scandinavian Working Papers in Economics

Discussion Paper Series in Economics,
Norwegian School of Economics, Department of Economics

No 20/2019: Hump-shaped cross-price effects and the extensive margin in cross-border shopping

Richard Friberg (), Frode Steen () and Simen A. Ulsaker
Additional contact information
Richard Friberg: Stockholm School of Economics, Postal: Stockholm School of Economics, P.O. Box 6501, 113 83 Stockholm Sweden
Frode Steen: Dept. of Economics, Norwegian School of Economics and Business Administration, Postal: NHH, Department of Economics, Helleveien 30, N-5045 Bergen, Norway
Simen A. Ulsaker: Dept. of Economics, Norwegian School of Economics and Business Administration, Postal: NHH, Department of Economics, Helleveien 30, N-5045 Bergen, Norway

Abstract: This paper examines the effect of cross-border shopping on grocery demand in Norway using monthly store×category sales data from Norway’s largest grocery chain 2011-2016. The sensitivity of demand to foreign price is hump-shaped and greatest 30-60 minutes’ driving distance from the closest foreign store. Combining continuous demand, fixed costs of cross-border shopping and linear transport costs `a la Hotelling we show how this hump-shape can arise through a combination of intensive and extensive margins of cross-border shopping. Our conclusions are further supported by novel survey evidence and cross-border traffic data.

Keywords: Cross-border shopping; competition in grocery markets; product differentiation

JEL-codes: F15; H73; L66; R20

48 pages, First version: December 17, 2018. Revised: September 23, 2019.

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