Fallout 4 expert merchants

Expert merchants are special characters who can be recruited for a settlement to man each type of store. Every merchant requires a level 3 store and some of them won't offer their services unless the settlement has a large enough population.

Note that settlements connected with supply routes are counted together for the purpose of determining settlement size, but the script only tracks direct connections.

Ronnie Shaw has similar characteristics to a level 4 / expert merchant: she sells special inventory in addition to level 1-3 inventory, has a higher caps balance than a level 3 trader, and is recruited via a quest.