“Quantitatively speaking, 'conversation' is inversely proportional to economic standing. If you are traveling in a bus, your fellow passengers will get into a conversation with you very quickly and without any reservation. If you are traveling by first class on a train, people will be more reserved. If you are traveling by air, then the likely hood of getting into a conversation is quite small. If you are in first class on an international flight then you may travel 24 hours without exchanging a single word with the person sitting next to you.”