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The Wall Street Journal reported that
people in the USA are becoming
of tipping because of the self-checkout
. Reporters wrote that many people are experiencing "tipping
". Nearly 20 per cent of Americans are now leaving tips for
they never used to leave tips for. They are even tipping when buying a
of water. This was because there are more
payment machines. A
at an airport store said a prompt on a self-checkout machine was like "
blackmail". The payments company Square reported that the machines are increasing the
of tips. It said Americans are leaving 15 per cent more tips than before.