Four domestic nonlife insurers announced business improvement plans Friday in the wake of an industrywide failure to pay legitimate claims that prompted closer scrutiny of structural problems in the sector, including a follow-the-leader mentality.

But the reforms announced separately by Tokio Marine & Nichido Fire Insurance Co., Sompo Japan Insurance Inc., Nipponkoa Insurance Co., and Mitsui Sumitomo Insurance Co. run along similar lines.

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