Business succession is crucial for an enterprise's sustainability, for which domain change/expansion is sometimes required. The case explores how a construction company changed/expanded their domain, and how it made possible to start a tea business, with analyses on factors as well as their business background. Kunitomo Shoji K.K., that has been doing a construction business since 1971, is located in a mountainous area, and started a tea business under the recession of construction industry. This paper, based on a series of research works on long-standing companies, explores how it became possible
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