Engineering Economics
“When one of the factors of production is fixed in quantity or is difficult to increase, increasing the other factors of production will result in a less than proportionate increase in output”. This statement is known as the:

Law of supply and demand
Law of supply
Law of diminishing return
Law of demand

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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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