Engineering Economics
Both architect and engineer make use of the cost estimate of the project:

For designing of the project
For choosing alternatives
For site selection
All of these

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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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