Principle of substitution is used in

✅ Explanation: The principle of substitution states that the best combination of resources will be the one that produces a given level of output at the least cost. This principle is used in product minimization, where the goal is to minimize the cost of producing a given product. By substituting one resource for another, a firm can often reduce its costs without sacrificing output.

🔑Key Points:
Uniform replacement of one expression/people /substance by another is called substitution.

• Following are the criterias for substitution:
-Eager observation is important before substitution so that perfect replacement takes place. 
-Physical and Mental presence makes the substitution authentic, conclusive, and reliable.
-Healthy environment bring mutual coordination and cordial relation among team members.
-Absolute Integrity is the quality of being honest and having strong moral principles. It is a prerequisite for substitution in the organization.