Greed, or avarice, is an inordinate or insatiable longing for material gain, be it food, money, status, or power.
As a secular psychological concept, greed is an inordinate desire to acquire or possess more than one needs. The degree of inordinance is related to the inability to control the reformulation of "wants" once desired "needs" are eliminated. Erich Fromm described greed as "a bottomless pit which exhausts the person in an endless effort to satisfy the need without ever reaching satisfaction." It is typically used to criticize those who seek excessive material wealth, although it may apply to the need to feel more excessively moral, social, or otherwise better than someone else.
The purpose for greed, and any actions associated with it, is possibly to deprive others of potential means (perhaps, of basic survival and comfort) or future opportunities accordingly, or to obstruct them therefrom, thus insidious and tyrannical or otherwise having a negative connotation. Alternately, the purpose could be defense or counteraction from such dangerous, potential negotiation in matters of questionable agreeability. A consequence of greedy activity may be an inability to sustain any of the costs or burdens associated with that which has been or is being accumulated, leading to a backfire or destruction, whether of self or more generally. So, the level of "inordinance" of greed pertains to the amount of vanity, malice or burden associated with it.
Envy (from Latin invidia) is an emotion which "occurs when a person lacks another's superior quality, achievement, or possession and either desires it or wishes that the other lacked it".Aristotle defined envy as pain at the sight of another’s good fortune, stirred by “those who have what we ought to have.” Bertrand Russell said that envy was one of the most potent causes of unhappiness. Not only is the envious person rendered unhappy by his or her envy, Russell explained, but that person may also wish to inflict misfortune on others, in forms of emotional abuse and violent acts of criminality. Although envy is generally seen as something negative, Russell also believed that envy was a driving force behind the movement of economies and must be endured to achieve the "keep up with Jones" system. He believed this is what helps to maintain democracy, a system where no one can achieve more than anyone else.