Engineering Economics
Oligopoly exists when there is/are:

Few sellers and many buyers
One seller and few buyers
Many sellers and few buyers
Few sellers and few buyers

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Engineering Economics
Which is NOT an essential element of an ordinary annuity?

The amounts of all payments are equal.
The payments are made at equal interval of time.
Compound interest is paid on all amounts in the annuity.
The first payment is made at the beginning of the first period.

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