Yes, the typical 15% is arbitrarily determined by what you order - not on number of trips, plates, drinks etc again why it can’t be considered directly as wages. As a result many lady friends I know order the cheapest items on the menu, in fact, select the restaurant based on the menu prices. While some of my other lady friends pay double or triple the typical tip (to compensate for the less generous tips). I find it very arbitrary.
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