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  "title": "Opportunity cost · one lecture, connected ideas",
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                  "text": "Lecture example: opportunity cost"
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                  "text": "Opportunity cost is the value of the next-best alternative forgone. The example is hypothetical, not advice about how to spend your time."
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                  "text": "Summary: scarce time creates a choice. Identify the best alternative you actually give up, not the sum of every possible activity."
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        "label": "Next-best alternative:\na paid shift",
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                  "text": "A hypothetical choice"
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                {
                  "type": "text",
                  "text": "Assume a two-hour paid shift at CHF 20 per hour is the next-best alternative to studying. The forgone earnings are CHF 40, ignoring taxes and other costs. Other benefits and costs could change the decision."
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                  "text": "Do not add the value of every rejected activity. The definition refers to the next-best alternative."
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        "label": "Why not add every\nrejected alternative?",
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