Here's what it is. English is pretty idiomatic about dangling verbs. They are silent a lot, meaning not written out at the end of the sentence. This is an example of that. You will generally not see a do or does left at the end of a sentence on GMAT. Here are a few examples:
I'm prettier than Bianca. (is -- not included)
Jamaal made better chicken than Ezra. (did -- not included)
Mom swims more fluidly than Dad. (does -- not included)
The difference is when there is a pronoun at the end of the sentence, then you will more often see the dangling verb included, i.e.:
I have more money than she does.
We're so much smarter than they are.
Bob googles so much faster than I do.
Note: In these cases, leaving off the dangling verb is also grammatically correct.
You will also note that each one of these examples is about judgment and comparisons. In the example sentence, it is not really a judgment of one thing OVER the other, but rather a simple comparison. Therefore the 'dangling do' is redundant and can be dropped very definitely.
Verbal Tutor
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