How much time is necessary for the work? Does the work have the value that corresponds at time? How much is the value of the work?
The estimate of work time is so important. But it’s too difficult. If you know budget and the list price, you can estimate the cost of commodities.
Let’s apply this system to the estimate of time.
Budget: Human or other power
Price: Needed time / Profit or Benefit
Is this OK?
Let’s check the hypothesis of “price”. If the relationship between numerator and denominator is “Needed time > Profit or Benefit”, the price is high. If the relationship is “Needed time < Profit or Benefit”, the price is low.