Engineering Economics
The ratio of the net income before taxes to net sales is called ______.

Current ratio
Profit margin ratio
Inventory turnover
Price-earnings ratio

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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 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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