a food-processing firm invest its profits in magazines

Hi! When I was reading John Steinbeck's America and Americans, I came across the following sentence:

(1) An oil company may extend into transportation, or a food-processing firm invest its profits in magazines, but there is one thing the corporation cannot do. (p. 57)

I thought the "invest" must be "invests." I was wondering whether it is a simple mistake or whether it can be acceptable for some reason.

I would appreciate your comments!

7/13/2011:07 PM

Original Post

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