Why do people lie?

Fear. This is the single most important reason for all lying. Right from students lying about homework to president of any country lying to cover his inappropriate behaviors. Everyone lies for the same reason - FEAR. There is another corresponding reason too and that is GREED. When people lie, the truth is hidden and some people lie so that they benefit from the fact that truth is hidden. There are lot of people who deal in financial markets and businesses who do not blink an eye before lying because they will get a lot of money if they do. But the sad fact is that people lie even if they get very small benefits.