Horizontal mergers and divestment dynamics in a sunset industry

Industries with declining demand tend to be riddled with chronic excess capital due to the presence of a business-stealing effect and fixed costs. This article highlights the potential of mergers to internalize this business-stealing effect and thereby promote divestment. Using the case of mergers in the Japanese cement industry, it examines whether such merger-induced divestment improves total welfare based on a dynamic model of divestment. The findings suggest that merged firms indeed tended to reduce capital more actively and that, as a result of these mergers, total welfare improved despite a reduction in the consumer surplus.