Engineering Economics
What are the common methods of computing depletion charge?

Discrete method and depletion allowance method
Rational method and irrational method
Unit method and percentage method
Conservative method and conventional method

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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 can prevent the entry of all other vendors in the market
the single vendor gets the absolute franchise of the product

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