Engineering Economics
If a seller recovers his capital along with accumulated compensating interest not in one single lump-sum payment but in periodical equal payments, over time:

Sinking Fund Annuity is availed
Capital Recovery Annuity fs availed
Present work Annuity is availed
Sinking Fund Annuity is availed

ANSWER DOWNLOAD EXAMIANS APP

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 can prevent the entry of all other vendors in the market
the single vendor is the only one who has the knowledge of the product

ANSWER DOWNLOAD EXAMIANS APP