Page:Lamps Plus, Inc. v. Frank Varela.pdf/2

2 the relief it requested, since it sought individual rather than class arbitration. The shift from individual to class arbitration is a “fundamental” change, Stolt-Nielsen, 559 U. S., at 686, that “sacrifices the principal advantage of arbitration” and “greatly increases risks to defendants,” AT&T Mobility LLC v. Concepcion, 563 U. S. 333, 348, 350. Avoiding these consequences gives Lamps Plus the “necessary personal stake” to appeal. Camreta v. Greene, 563 U. S. 692, 702. Pp. 3–5.

(b) The Ninth Circuit’s contrary conclusion was based on the state law contra proferentem doctrine, which counsels that contractual ambiguities should be construed against the drafter. That default rule is based on public policy considerations and seeks ends other than the intent of the parties. Such an approach is flatly inconsistent with “the foundational FAA principle that arbitration is a matter of consent.” Stolt-Nielsen, 559 U. S., at 684. Varela claims that the rule is nondiscriminatory and gives equal treatment to arbitration agreements and other contracts alike, but an equal treatment principle cannot save from preemption general rules “that target arbitration either by name or by more subtle methods, such as by ‘interfer[ing] with fundamental attributes of arbitration,’” Epic Systems Corp. v.