Tradeoffs for a hunter gatherer and the production possibilities frontier, and the notion of "ceteris paribus" (which means "everything else held equal").
Watch the next lesson: https://www.khanacademy.org/economics-finance-domain/microeconomics/choices-opp-cost-tutorial/production-possibilities/v/opportunity-cost?utm_source=YT&utm_medium=Desc&utm_campaign=microeconomics
Missed the previous lesson? https://www.khanacademy.org/economics-finance-domain/microeconomics/consumer-producer-surplus/externalities-topic/v/tragedy-of-the-commons?utm_source=YT&utm_medium=Desc&utm_campaign=microeconomics
Microeconomics on Khan Academy: Topics covered in a traditional college level introductory microeconomics course
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