Because the part which is explaining two stores "One with better................employee wages" is extra! If you ignore it, the text will still make sense. This is one of the rules that I explained in the SAT verbal section punctuation video: I explained it in the section "comma rules."
Because the part which is explaining two stores "One with better................employee wages" is extra! If you ignore it, the text will still make sense. This is one of the rules that I explained in the SAT verbal section punctuation video: I explained it in the section "comma rules."