Engineering Economics
What is the type of annuity where the first payment does not begin until some later date in the cash flow?

Annuity due
Perpetuity
Deferred annuity
Ordinary annuity

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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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