A firm owned by a single person who has unlimited liability for the firm's debt is called a: sole proprietorship
What is a sole proprietorship?
A sole proprietorship is a one man business where the owners the entire the business, contributes all finances as well as unlimited liability for the debts of the business.
This means that when the assets of the business are not enough to settle its debts, the owners would pay the excess debts from their private account or using their personal assets to settle firm's debts
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