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Behavioural models in humans have been extensively researched in psychology. The article describes some of them which can be used by Product Managers for building better products. There have been three core motivators for Humans and this has not changed much since the stone age. The part of the brain that responds to pleasure (or reward) becomes more active during its anticipation rather than the reward itself. The principle is used by apps like Google pay where variable reward creates more excitement through unpredictability. For this reason, almost all popular multiplayer games like PUBG today have infinite variance.