Greed in psychology is an excessive desire to acquire or possess more than what one needs or deserves, especially with respect to material wealth. Greed is the excessive or rapacious desire and pursuit of money, wealth, power. It is generally considered a vice, and is one of the seven deadly sins in Catholicism.
Buddhists believe greed is based on incorrectly- connecting material wealth with happiness. This is caused by a view that exaggerates the positive aspects of an object; that is, acquiring material objects has less impact than we imagine on our feelings of happiness. This view has been corroborated by studies in the field of happiness economics, which confirm that beyond the provision of a basic level of material comfort, more wealth does not increase happiness.