Concept:The law of diminishing returns explains that adding more variable inputs to a fixed input eventually leads to smaller additional output.
Explanation:Diminishing returns occurs in the short run when one input is increased while other inputs remain fixed.
Common causes include an increase in variable inputs on fixed resources, constant technology, and land fragmentation.
These conditions reduce the extra output from each new unit of input.
Technological innovations, on the other hand, improve production methods and raise efficiency.
Technology changes the production situation, so it does not cause diminishing returns; it actually delays or prevents it.
Therefore, the factor that is not a cause of diminishing returns is technological innovation.
Answer:D. Technological innovations.