The thing which Brad should do in the given situation is to offer to split the costs of the meal.
This refers to the interaction between two or more people who are interested in entering a business partnership.
With this in mind, we can see that Brand goes for lunch with a potential supplier of which the supplier encourages him to order as much as he wants and insists on paying at the end of the meal, what Brad should do in this situation is to offer to split the costs of the meal.
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