What is the connection between St. Michael and people who work in grocery stores? When examining the wikipedia page on St. Michael it says:

Michael the Archangel is the patron saint of grocers, mariners,
paratroopers, police officers, and military personnel.

Mariners, military, and cops I can understand. But how did St. Michael come to be known as the patron for grocery store workers?
This is most likely an adoption, due to the fact that in Medieval times, soldiers (police if you like) would protect the market places where grocers would sell their goods.