External conditions also matter in terms of when and how often we lie.We are more likely to lie,research shows,when we are able to rationalise it,when we are stressed and fatigued or see others being dishonest.And we are less likely to lie when we have moral reminders or when we think others are watching."We as a society need to understand that,when we don't punish lying,we increase the probability ii will happen again."Ariely says