One would need to know the pay scale and employment pattern at Wal-Mart to determine the answer to your question.
However, if we make a reasonable guess, namely, that Wal-Mart pays wages below $12 an hour only to entry-level workers. (If this were not the case, then it’s hard to believe that computed prices would rise only 1.1 percent if Wal-Mart raised the minimum wage it pays workers to $12. Put another way, contrary to the bashing by the anti-Wal-Mart crowd, Wal-Mart must be paying reasonable high wages to most of its workers already if raising the minimum to $12 would only increase computed prices by 1.1 percent.) Then if Wal-Mart were forced to pay wages at $12 or above to all its workers, it would have to eliminate entry-level positions. Given that such a minimum wage restriction is the reason it refused to open its planned stores in the D.C. area, we can surmise that Wal-Mart’s current business model depends on these positions. It seems that Wal-Mart would have to significantly change the way it operated to survive a $12 minimum wage.