A 40-year study found Japanese family firms led by adopted heirs often outperform those run by biological sons

For most parts of the world, family businesses are often passed down from parents to their biological children; however, Japan has long embraced a different tradition where, rather than handing leadership automatically to a son by birth, many Japanese family firms adopt adult heirs, often talented managers or the husbands of daughters, to preserve family business across generations. Although the practice may seem unusual to many, research suggests that it can have measurable business benefits.

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