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The first multicellular organism appears around
Prices
The monetary value assigned to goods and services, determining the terms of exchange in a market.
Bundles
Combinations of goods and services offered together as a single package, often at a discounted price.
Weak Axiom
A principle in consumer theory that if a consumer prefers bundle A over bundle B when both are affordable, they will not choose B over A when income or prices change, holding everything else constant.
Strong Axiom
Often refers to the strong axiom of revealed preference in economics, a principle used to infer a consumer's complete preference ordering over goods.
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