A businessman from Singapore, upon visiting the United States for the first time, was unfamiliar with U.S. tipping customs. He could not understand the cool reception he received when he did not tip the taxi driver who took him to his Dallas hotel, the bellman who helped him with his luggage, the concierge who provided special services, or the server in the hotel restaurant.

Explain what the visitor from Singapore should have known about U.S. tipping customs, including specific amounts and/or percentages, in each of these situations. Be prepared to cite specific books on etiquette that include U.S. tipping information.