Deprivation Theory is that people who are deprived of things deemed valuable in society, money, justice, status or privilege, join social movements with the hope of redressing their grievances. That is a beginning point for looking at why people join social movements; however, it is even more important to look at relative deprivation theory, a belief that people join social movement based on their evaluations of what they think they should have, compared with what others have. On the contrary, absolute deprivation is people's actual negative condition; relative deprivation is what people think they should have relative to what others have, or even compared with their own past or perceived future. Improved conditions fuel human desires for even better conditions and so can spark revolutions.