Comparison

[sonu_gmat]

The annual per capita income in city X is lower than in any other city in the world.

Is it a wrong comparison since this does not have '.....than that.....' in the construction.



[deleted the rest - you can't copy OG questions here]

[RonPurewal]

The annual per capita income in city X is lower than in any other city in the world.

Is it a wrong comparison since this does not have '.....than that.....' in the construction.

the precise reason why is this:

when there are ATTACHED ESSENTIAL MODIFIERS (i.e., modifiers that are not cordoned off by commas), such as "in city X", you need to create a parallel construction that's PARALLEL TO THE ENTIRE THING.

so, since "annual per capita income in city X" is one piece, you NEED a parallel construction that's parallel to the entire thing.
hence, "that in any other city".

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you could also write:

"the annual per capita income is lower in city X than in any other city in the world".

in this case, "in city X" is separated from "income" by a verb, so that's not considered one piece anymore. therefore, the two purple parts are full parallel structures.

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the OG problem you had posted (which I deleted) isn't even close to your example. the first part of that question doesn't even have a preposition, for instance. (please DO NOT re-post that question.)