I’d always thought business doors opened outward for customer convenience. The business assumes you are coming in to buy their​ products and come out with both your hands full, so opening the door inward would be difficult.

According to DumbLaws this is not correct:

All buildings erected in this state for theatrical, operatic, or other public entertainments of whatsoever kind shall be so constructed that the shutters to all entrances to said building shall open outwardly and be so arranged as to readily allow any person inside said building to escape therefrom in case of fire or other accident.

I like the actual law better than my preconceived notion and I think it’s fun to find out the truth versus just what you’ve always believed.