Question about employee traits

Do traits like Inverse Bargaining (-5% price of products served), Poor Salesman (+5% chance of selling cheapest item) and Friendliness (+5% reputation with orders served) only affect that employee, or the entire tavern?

For example, I have a housekeeper with Friendliness, but he also has Poor Salesman. If those two only affect HIM, it isn't a huge deal because I only have 2 rooms at the moment, so his sales are a smaller percentage of the profit. But if his traits are also affecting the bartender and waiter, he needs to go.