Examlex
Define external validity and describe four threats to external validity.
Incremental
Relating to a small or gradual change or increase, often considered in the context of adjustments or improvements.
Opportunity
A set of circumstances that makes it possible to do something or achieve a particular goal.
Scarcity
Refers to the fundamental economic problem of having seemingly unlimited human wants in a world of limited resources.
Marginal Revenue
The additional income earned from selling one more unit of a good or service.
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