Justice BLACK delivered the opinion of the Court.
In this case . . . , we are asked to review . . . a Kansas statute making it a misdemeanor for any person to engage "in the business of debt adjusting" except as an incident to "the lawful practice of law in this state." The statute defines "debt adjusting" as "the making of a contract, express, or implied with a particular debtor whereby the debtor agrees to pay a certain amount of money periodically to the person engaged in the debt adjusting business who shall for a consideration distribute the same among certain specified creditors in accordance with a plan agreed upon. . . ." [Skrupa contends that he] was engaged in the business of "debt adjusting" as defined by the statute, that his business was a "useful and desirable" one, that his business activities were not "inherently immoral or dangerous" or in any way contrary to the public welfare, and that therefore the business could not be "absolutely prohibited" by Kansas. . . .
. . . Under the system of government created by our Constitution, it is up to legislatures, not courts, to decide on the wisdom and utility of legislation. There was a time when the Due Process Clause was used by this Court to strike down laws which were thought unreasonable, that is, unwise or incompatible with some particular economic or social philosophy. In this manner the Due Process Clause was used, for example, to nullify laws prescribing maximum hours for work in bakeries, Lochner v. New York, 198 U.S. 45 (1905), outlawing "yellow dog" contracts, Coppage v. Kansas, 236 U.S. 1 (1915), setting minimum wages for women, Adkins v. Children's Hospital, 261 U.S. 525 (1923), and fixing the weight of loaves of bread, Jay Burns Baking Co. v. Bryan, 264 U.S. 504 (1924). This intrusion by the judiciary into the realm of legislative value judgments was strongly objected to at the time, particularly by Mr. Justice Holmes and Mr. Justice Brandeis. . . .
The doctrine that prevailed in Lochner, Coppage, Adkins, Burns, and like cases that due process authorizes courts to hold laws unconstitutional when they believe the legislature has acted unwisely has long since been discarded. We have returned to the original constitutional proposition that courts do not substitute their social and economic beliefs for the judgment of legislative bodies, who are elected to pass laws. As this Court stated in a unanimous opinion in 1941, "We are not concerned . . . with the wisdom, need, or appropriateness of the legislation." Legislative bodies have broad scope to experiment with economic problems, and this Court does not sit to "subject the State to an intolerable supervision hostile to the basic principles of our Government and wholly beyond the protection which the general clause of the Fourteenth Amendment was intended to secure." It is now settled that States "have power to legislate against what are found to be injurious practices in their internal commercial and business affairs, so long as their laws do not run afoul of some specific federal constitutional prohibition, or of some valid federal law."
. . . We conclude that the Kansas Legislature was free to decide for itself that legislation was needed to deal with the business of debt adjusting. Unquestionably, there are arguments showing that the business of debt adjusting has social utility, but such arguments are properly addressed to the legislature, not to us. We refuse to sit as a "superlegislature to weigh the wisdom of legislation," and we emphatically refuse to go back to the time when courts used the Due Process Clause "to strike down state laws, regulatory of business and industrial conditions, because they may be unwise, improvident, or out of harmony with a particular school of thought." Nor are we able or willing to draw lines by calling a law "prohibitory" or "regulatory." Whether the legislature takes for its textbook Adam Smith, Herbert Spencer, Lord Keynes, or some other is no concern of ours. The Kansas debt adjusting statute may be wise or unwise. But relief, if any be needed, lies not with us but with the body constituted to pass laws for the State of Kansas.