Final answer:
Business and industry groups, worker groups, and financial groups are the three categories of interest groups.
Step-by-step explanation:
Economic interest groups include business and industry groups, worker groups, and financial groups. Business and industry groups, such as the National Association of Manufacturers, advocate for fewer regulations, while worker groups, like labor unions, seek to improve collective bargaining rights. Financial groups, such as banks and investment firms, work to influence legislation related to the financial industry.