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The marginal cost of an additional unit of a private good is zero.
Melatonin
A hormone that regulates the sleep-wake cycle, produced by the pineal gland in response to darkness.
Pineal Gland
A small endocrine gland in the vertebrate brain that produces and regulates some hormones, including melatonin, which affects sleep patterns.
Melatonin
A hormone produced by the pineal gland that regulates sleep-wake cycles and is often used to treat sleep disorders.
REM Sleep
Rapid Eye Movement (REM) sleep, a unique phase of sleep involving vivid dreams, and is thought to play a role in learning and memory.
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