Harshaw's Law

Harshaw's Law is Jubal Harshaw’s deliberately comic rule that a daughter can consume ten percent more than a man earns in any ordinary occupation, regardless of his income. Introduced during a conversation with Captain Willem van Tromp about money and the ships he does not want to give up, it turns family expense into a joke while sharpening Harshaw’s distinction between wanting money to spend and devoting one’s life to becoming rich.

Formulation and Context

Harshaw presents the rule as a law of nature that had been widely experienced but never formulated, and names it after himself. Its stated measure is precise—ten percent—and its scope sweeping: a daughter’s costs exceed what a man can make in any normal occupation, whatever the amount. The comic authority of a quantified, newly named principle lets Harshaw treat a familiar financial complaint as if he had discovered a general economic law.

The exchange begins with the captain’s recognition that money would not tempt him to give up his ships, followed by his admission that he would not mind having money as well. Harshaw answers by separating modest spending money from wealth on a scale that requires a battery of tax specialists. The latter, he warns, would ground the captain as surely as resigning from his post.

Wealth, Work, and Character

The captain proposes putting great wealth into bonds and living on the coupons, imagining that money could remain passive while he continued his existing life. Harshaw rejects that separation between possessing wealth and the habits needed to acquire it. In his account, great wealth costs a lifetime of single-minded work, with its growth taking precedence over every other interest.

To challenge the claim that opportunity has passed, Harshaw says that seven out of ten of the planet’s wealthiest men began without a shilling. High taxation and socialism, he argues, do not necessarily stop people committed to accumulating wealth: they adapt to new rules and eventually change them. His comparison to a premiere ballerina emphasizes the narrowness and intensity of that pursuit, not merely its financial reward.

Significance

Harshaw’s conclusion is personal rather than abstract: he does not think the captain wants to make money, but to have money available to spend. The distinction resolves the conversation’s apparent contradiction. The captain can value additional money while refusing the all-consuming ambition Harshaw associates with becoming rich—and, more pointedly, while declining a form of prosperity that would take him away from his ships.

The daughter-and-income formula is a comic aside, but its function is also conversational. Harshaw uses a mock-universal rule to move from the captain’s wish for more money to the real cost he sees in pursuing it: not simply the expense of raising a daughter, but the loss of a chosen life to wealth-seeking. The law’s joke and its serious warning are held together by the same arithmetic of what money can take.