I'm so appalled, I might buy the mall
Just to show niggas how much more I have in store

from Kanye West (Ft. CyHi The Prynce, Jay Z, Pusha T, RZA & Swizz Beatz) – So Appalled Lyrics on Rap Genius

Meaning

A pun: malls have stores

“Buy the mall” ie. he’s so rich he could put on a fabulous display of wealth like buying a whole shopping mall just to show the other ‘pretend’ rappers just how powerful he is and how ‘scared’ they should be.

This is also a play on words. He’s using store as both what his capabilities are as a businessman, as well as his “stored” money in the bank.

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