2. Research Question and Hypothesis
3. Research Design
4. Data and Analysis
5. Interpersonal trust
6. Happiness and well-being
7. Involvement in voluntary organizations
8. Political trust
9. Results and discussion
Based on a methodological individualist position, rational choice theory seeks to explain all social phenomena in terms of the rational calculations made by self-interested individuals.  It regards social interaction as social exchange. By rationality it means that people are motivated by the rewards and costs of actions and by the profits that they can make. As a result, individuals face incentives to behave selfishly, seeking the benefits of cooperation without paying the costs. All human communities confront collective action problems.  In order to overcome these problems, a variety of institutional designs are elaborated by scholars, policy-makers, and political leaders throughout the world. However, there is something more important in society than institutional change. Trust makes it possible to maintain peaceful and stable social relations that are the basis for collective behavior and productive cooperation.
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