Question : If a change in all input leads to a proportionate change in output, it is a case of:

Option 1: constant returns to the scale

Option 2: diminishing returns to the scale

Option 3: increasing returns to the scale

Option 4: variable returns to the scale

Question : When all inputs are doubled and a result, output also doubles, then we have:

Option 1: constant returns to scale

Option 2: decreasing returns to scale

Option 3: increasing returns to scale

Option 4: none of the options