This article discusses the role of strategic alliance, mergers, and acquisitions in achieving sustained growth and corporate profitability in both domestic and international markets. It provides a case study of Unilever plc and its success story. It also distinguishes between external and internal economies of scale and explains the phenomenon of intra-industry trade. The article examines the extent of intra-industry trade between the UK and the EU in recent years and explores the implications of the results for UK external trade policy and strategy after Brexit.