Fun with Conan the Grammarian

Dear Conan,

This line was in a story from AP:

Major stock indexes were almost a sideshow during the session, with the credit markets as the main event.

Shouldn’t that be stock indices?

Rob

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Dear Rob,

I must say I am impressed that you, along with other faithful readers, have begun to scrutinize what you read. That means grammar is beginning to matter to you, and I weep with joy and relief.

In answer to your question, Rob, either is actually correct. I’m proud of you for even knowing the other plural form of index, especially since you went to Baylor. Bravo!

Your ally in correctness,

Conan