Case study on change management at Walmart. Tahir Abbas. Change management is an essential aspect of any business seeking to remain competitive in a dynamic market environment. Walmart, one of the world's largest retail giants, has faced significant changes in the retail industry, including at Wal-Mart alone. market share and Japan represents it. 5 of Wal-Mart, in revenue, source. 20. Challenges in JAPAN Geography Japan is a small country with limited space. Small housing and apartment sizes, with high rents, mean Japanese people should minimize their purchases.