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

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Engineering Economics
Each financial ratio is generally compared by

A ratio of some selected firms most progressive and successful at the point of consideration
All of these
A past ratio calculated from the past financial standard of the firm
A ratio developed by using the projected financial statement of the firm

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