Examlex
According to the Ptolemaic (Greek)system,the planets have circular orbits.
Patent
A legal document granted by the government giving an inventor exclusive rights to make, use, and sell an invention for a certain period of years.
Marginal Cost
The increase or decrease in the total cost of a production run for making one additional unit of an item.
Zero Marginal Cost
The situation when producing an additional unit of a good or service does not increase the total cost of production, often associated with digital products or services.
Pushcart
A small cart or wheeled vehicle typically used by vendors for selling goods in public places.
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