The following graph shows average fixed costs, average variable costs, average total costs, and marginal costs of production. 
Marginal cost is minimized when output equals:
Definitions:
Placenta
An organ that develops in the uterus during pregnancy, providing oxygen and nutrients to the growing baby and removing waste products from the baby's blood.
Birth Defects
Conditions that are present from birth, causing abnormalities in body structure, function, or metabolism.
Heroin
An opioid drug derived from morphine, often used illegally for its euphoric effects.
Heart Defects
Anomalies present at birth that affect the structure and function of the heart.
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