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Which threat to internal validity is related to unexpected events?
Public Goods
Goods that are non-excludable and non-rivalrous, meaning they are accessible to all and one person's use does not diminish another's.
Nonexcludable
Describes a good or service for which it is not possible to prevent people who have not paid from consuming or using it, such as public parks or street lighting.
Efficiency
The optimal allocation of resources to maximize the desired outputs while minimizing waste or unnecessary effort.
Nationally Franchised
Businesses that operate under a licensing agreement allowing them to sell products or services under a national company's brand and operational model.
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