A doubling of inputs will lead to output also doubling is called
constant returns to scale.
Why this happens?
Actually there are 3 kinds of returns to scale :
1. Increasing returns to scale,
2. Diminishing returns to scale,
3. Constant returns to scale,
- Increasing returns to scale : It occurs when
suppose if we double the input, the output increases more than
double. This happens because when we expand our unit or business
the factors of production are undivisable. Means they will be
available in a certain quantity. So, output in initial stages
increases more then inputs employed.
- Constant returns to scale : Now increasing
returns will not continue indefinitely. As our unit expands further
there are some factors like technology, information, divisibility
of labor, etc due to which the returns start to be constant as
whatever we add as input we get it back in the form of output.
- Diminishing returns to scale : when our unit
is further expanded, our output begins to diminish and we get
diminishing returns to scale.