Today I went to two neighborhood stores. They are both little mom-and-pop stores. I went to one store to buy a light bulb, so it's a lighting store. After that, I went next door to a photo-printing store. Interesting that both stores are owned by the same boss! Lighting and photo both belong to the Fire element. The owner is a Chinese. I did not chat with them, but it's very likely that they got into this business based on some Bazi or Fengshui advise that Fire is auspicious for the owner.
By the way, once it's auspicious for the owner, it matters less that employees or children of the owner have the same auspicious element. When the owner enjoys the good luck from the business, employees and children benefit through the owner. Unless if an employee wants to become independent and open the same kind of business, in which case that element had better be auspicious in their Bazi chart.