The answer is entrepreneurship.
Opportunity cost simply means the cost of what an individual forgoes in order to get something else.
Property rights refers to the legal ownership of assets and how they can be used.
Federal regulation refers to the regulations or laws that are set by the Federal government. These can include regulations related to finance, environment etc.
Entrepreneurship refers to the creation of a business in order to generate profit. It is the economic concept that allows businesses to freely buy and sell goods as they see fit.
Therefore, the correct answer is entrepreneurship.
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