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1.) material benefits: such as direct monetary benefits from policies that the group advocates, discounts on travel or prescriptions, and even monthly magazines. 2.) Solidary benefits:are less tangible. They range from the simple pleasure of being surrounded by people with similar interests and perspectives to the networking benefits of interacting with people who share professional or personal concerns. 3.) Expressive benefits: are the least tangible in that they consist of having a specific opinion expressed in the larger social or political sphere. When individuals join a group, they know that their viewpoint is being actively represented in the policy system, and that knowledge can be gratifying all by itself.

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