The Efficient Frontier is a graph that shows the portfolio (combination of stocks and bonds) that would give you the highest return at each level of risk. Any point above that is unattainable without a change in risk, any point below is inefficient (that is you could receive greater return for that mix of stocks and bond then you are currently receiving).
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a production possibilities frontier graph
This is known as the law of diminishing returns and can occur because factor on the frontier is deemed to be production efficient and production inside frontier.
A production possibilities frontier, or PPF, is a curve graph which shows combinations of two or more goods or services. The graph shows these goods or services being produced while using a maximum amount of resources.
A production possibilities frontier graph
PPF- product possibility frontier.