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

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Engineering Economics
Pick up the correct reason for making conceptual (or preliminary) estimate from the following:

To have a check on a definitive cost estimate
All of these
To check quotations from contractors and/or sub-contractors
To compute target estimate for the owner while drawing and specifications are in initial stage

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