In America, tipping is optional in name only.Legally it's voluntary but if you slink out of a restaurant without leaving a gratuity of between 20 and 25 per cent, you're likely to be chased by a waiter demanding to know why.
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People may not have the money for a tip and are embarrassed at leaving a small tip. They think you'll think they “forgot” rather than they were cheap.
Japan. Unlike Spain, Japan is a country where you should not tip at all; it's actually offensive. In the majority of Japanese restaurants a bill is not brought to the table. Instead, payment is accepted at the bar, so even trying to leave a tip for the waiter can be tricky.
Just as in Japan, it is not customary to tip in China. Tipping in China is generally uncommon and can even be considered rude or embarrassing in some circumstances so when taking a taxi, enjoying a refreshing drink or tucking into a delicious meal there's no requirement to leave any gratuities.