In diversity cases, how does Erie guide choice of law?

In diversity cases, how does Erie guide choice of law?

• A. Apply the state's substantive law (including statutes of limitations) and use federal procedure.
• B. Apply federal common law for all substantive issues.
• C. Apply the state's procedural rules and federal substantive law.
• D. The court may apply any state's law it chooses.

Answer: (A)

In diversity cases, Erie tells us to treat the state's law as controlling on substance, while keeping the federal rules on procedure. That means the court uses the state’s substantive law to determine the rights and obligations of the parties, including the state's statute of limitations for bringing a claim. At the same time, the court uses federal procedure to govern how the case moves forward—pleadings, discovery, trial mechanics, and other procedural aspects. This separation matters because it prevents a federal court from creating its own general federal common law on substantive matters and ensures that the forum state's concerns about remedies and timing are respected. That’s why the best choice says to apply the state’s substantive law (including statutes of limitations) and use federal procedure. The other options miss the key idea: federal common law cannot govern all substantive issues in diversity; procedural rules are not replaced by state procedures; and the court cannot pick any state's law arbitrarily.

In diversity cases, Erie tells us to treat the state's law as controlling on substance, while keeping the federal rules on procedure. That means the court uses the state’s substantive law to determine the rights and obligations of the parties, including the state's statute of limitations for bringing a claim. At the same time, the court uses federal procedure to govern how the case moves forward—pleadings, discovery, trial mechanics, and other procedural aspects.

This separation matters because it prevents a federal court from creating its own general federal common law on substantive matters and ensures that the forum state's concerns about remedies and timing are respected. That’s why the best choice says to apply the state’s substantive law (including statutes of limitations) and use federal procedure.

The other options miss the key idea: federal common law cannot govern all substantive issues in diversity; procedural rules are not replaced by state procedures; and the court cannot pick any state's law arbitrarily.