Engineering Economics
In what method of computing depreciation where it assumes that the loss in value is directly proportional to the age of the equipment or asset?

Declining balance method
Sum-of-year digit method
Straight line method
Sinking fund method

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Engineering Economics
Perfect monopoly exists only if:

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

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