Pluralism:

The pluralist perspective is one that asserts that the power of a complex society is divided up, and regulated by a diverse range of interest groups but also subscribes to the idea that power works as a “zero-sum”, meaning that in order for a person or group of people to achieve power it must be taken from someone else. Notable pluralists include social scientist Robert Dahl.

“The Pluralists believe that:

• Power is dispersed and fragmented.
• Groups provide a more effective means of representation.
• The larger the group the more influence it will have.
• Policies are established through bargaining and compromise and tend to be fair to all in the end.”

– http://education-portal.com/academy/lesson/social-power-theories-pluralist-power-elite-marxist-models.html#lesson