Examlex
Wings on insects, flowers on plants, and feathers on birds are all examples of variations of some preexisting structures, otherwise known as:
Substitutes
Two goods for which an increase in the price of one leads to an increase in the demand for the other.
Complements
Two goods for which an increase in the price of one leads to a decrease in the demand for the other.
Budget Constraints
A representation of the trade-offs between different goods and services that a consumer can afford with their limited income.
Optimum
The most favorable condition or level for growth, reproduction, or efficiency, or the best or most efficient use of resources.
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