World Travel City Photography

So there are increasing returns to scale:
(3) O = I2 / 16. This equation (solving for s in (1) and substituting in (2)) shows that with twice the inputs, you produce quadruple the output.
Also, economies of scale:
(4) I = 4O1 / 2. This equation (solving for I in equation (3)) shows that the same output requires less input.