Why a kidney cannot be priced
In the United States, the ban on paying for an organ draws a line between compensating a donor for costs and buying the organ itself. The distinction matters because kidneys are scarce and a sale could make access depend on wealth: a person with money might gain an advantage, while someone in financial hardship could feel pressured to take medical risks for cash.
Treating donation as a gift is meant to keep the decision voluntary and the allocation process focused on medical need and compatibility, rather than bargaining power. A kidney transplant still requires evaluation of whether a donor can safely give one and whether the organ is suitable for a recipient. Money changing hands for the organ could complicate those decisions by giving someone a financial stake in proceeding.
The costs do not disappear
A gift can still impose real expenses. Donors may face travel costs, time away from work, or other financial strains connected with evaluation and recovery. Reimbursement for legitimate donation-related expenses is different from paying someone a price for the kidney: it aims to prevent the donor from being left out of pocket, not to create a market for organs.
That distinction has a practical consequence. A system can forbid organ sales and still need ways to keep donation from becoming financially harder for people who cannot afford time away or travel. The kidney is given freely; the circumstances around giving it need not be cost-free.
