Engineering Economics
Perfect monopoly exists only if:

the single vendor is the only one who has the knowledge of the product
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

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Engineering Economics
Using factor method, the depletion at any given year is equal to:

Initial cost of property divided by the number of units sold during the year
Initial cost of property times number of units sold during the year
Initial cost of property divided by the total units in property
Initial cost of property times number of unit sold during the year divided by the total units in property

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