Overview in the Encyclopedia Britannica (2021)

What has the U.S. Congress done to regulate lobbying? (USA: Cliffs Notes 2021)

This lesson uses the battle over school lunch ingredients to illustrate how interest groups and lobbying affect public policy. Take a side in the battle, create an interest group, and try to influence public policy (USA: iCivics 2018). 

Special interest groups are groups of individuals that make policy-related appeals to government - like the NRA, AARP, or the U.S. Chamber of Commerce. (8 minutes / USA: Crash Course Government and Politics #42)  

Students identify various court cases, policies, and laws that outline what interest groups can and cannot do. The evaluate the arguments for and against whether contributions are a form of freedom of speech (USA: CUNY OER 2021).

Video on NAACP, US Chamber of Commerce, NRA, AARP, AFL-CIO, AMA (6 minutes / USA: Khan Academy 2021)

AP Government review video for any government textbook (14 minutes / USA: Jocz Productions).

In this video, the nonpartisan Virginia Public Access Project examines the role interest groups play in Virginia politics (USA 2016-21).

Individuals, acting independently, and solely and rationally consulting their own self-interest, will ultimately deplete a shared limited resource even when it is clear that it is not in anyone's long-term interest for this to happen (Wikipedia 2010).

Final chapter of the famous book by English economist John Maynard Keynes (1936). It introduced the concepts of the consumption function, the principle of effective demand and liquidity preference, and gave new prominence to the multiplier and the marginal efficiency of capital. (Gutenberg 2021)