Explanation:

- Economic institution: Refers to organizations that play a role in the economy, like banks or financial entities. They are involved in economic policymaking and shaping economic frameworks.

- Trade association: Group formed by businesses in the same industry. Their goal is to promote and protect the interests of their industry.

- Pressure group: Organisations like FICCI (Federation of Indian Chambers of Commerce & Industry) and CII (Confederation of Indian Industry) often act as pressure groups. They influence public policy and decision-making to favor their member interests.

- Interest group: They represent specific interests and aim to influence policymakers. While similar to pressure groups, they focus more broadly on particular issues.