How to Hire a Merchant
To hire a merchant, you must obtain an employment contract. Each contract represents a kind of merchant. Most merchant contracts can be purchased from a steward in a safe zone or player’s city. After getting the contract, open the management panel of the building, click the empty employee slot at the bottom, and the list of employee contracts that can be placed will be displayed. Click the contract that you want to place.
As the building grade increases, so does the number of employees that can be placed. Employees will remain in the building unless they are fired, resigned (without pay) or the building is destroyed. When building ownership changes, so do the employee’s employer.