Engineering Economics
What refers to the interest rate at which the present work of the cash flow on a project is zero of the interest earned by an investment?

Yield
Return of investment
Economic return
Rate of return

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Engineering Economics
Perfect monopoly exists only if:

the single vendor is the only one who has the permit to sell
the single vendor gets the absolute franchise of the product
the single vendor is the only one who has the knowledge of the product
the single vendor can prevent the entry of all other vendors in the market

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