Examlex
The most conspicuous features on the surface of the Sun are dark areas called ________.
Substitution
The act of replacing one good or service with another in response to shifts in relative prices or changes in consumer preferences.
Bundle
A group of products or services that are sold together as a single package, often at a discounted price.
Optimal Choice
The best possible selection among various alternatives, maximizing efficiency or utility under given constraints.
Income
The money received by a person or organization for work, goods, or investments, representing the flow of cash or cash-equivalents.
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