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Rh that would be necessary … to satisfy [the] Pike” test as petitioners conceive it. Davis, 553 U. S., at 353.

Our case illustrates the problem. On the “cost” side of the ledger, petitioners allege they will face increased production expenses because of Proposition 12. On the “benefits” side, petitioners acknowledge that Californians voted for Proposition 12 to vindicate a variety of interests, many noneconomic. See App. to Pet. for Cert. 192a (alleging in their complaint that “Proposition 12’s requirements were driven by [a] conception of what qualifies as ‛cruel’ animal housing” and by the State’s concern for the “ ‘health and safety of California consumers’ ”). How is a court supposed to compare or weigh economic costs (to some) against noneconomic benefits (to others)? No neutral legal rule guides the way. The competing goods before us are insusceptible to resolution by reference to any juridical principle. Really, the task is like being asked to decide “whether a particular line is longer than a particular rock is heavy.” Bendix Autolite Corp. v. Midwesco Enterprises, Inc., 486 U. S. 888, 897 (1988) (Scalia, J., concurring in judgment).

Faced with this problem, petitioners reply that we should heavily discount the benefits of Proposition 12. They say that California has little interest in protecting the welfare of animals raised elsewhere and the law’s health benefits are overblown. But along the way, petitioners offer notable concessions too. They acknowledge that States may sometimes ban the in-state sale of products they deem unethical or immoral without regard to where those products are made (for example, goods manufactured with child labor). See Tr. of Oral Arg. 51 (“[A] state is perfectly entitled to enforce its morals in state”); see also Western Union Telegraph Co. v. James, 162 U. S. 650, 653 (1896) (holding that States may enact laws to “promote … public morals”). And, at least arguably, Proposition 12 works in just this way—banning from the State all whole pork products derived from practices its voters consider “cruel.” Petitioners