According to theory, people who are satisfied with their present condition are less likely to seek social change. social movements arise as a response to people's perception that they have been deprived of their "fair share."

The answer is "Relative Deprivation Theory".

Relative deprivation theory alludes to the possibility that sentiments of hardship and discontent are identified with a coveted perspective. Sentiments of relative hardship emerge when wants end up real desires and those wants are obstructed by society. Relative deprivation theory is connected to sociopolitical, monetary, and hierarchical issues.