Law of Diminishin returns- influence on curves.?

Question

Explain how the law of diminishing returns influences the shapes of the total variable-cost and total cost curves.

Answer 1

Cost curves have a U shape. As production increase costs per unit starts to fall and keep falling until diminishing returns occur. The rate of increase win diminish along this section of the curve. The curve will then go up.
Fixed costs are fixed and therefore wont change.

Answer 2

The cost curves are upward sloping. They are usually related to revenue or marginal revenue curves which are downward sloping. In other words, each added cost results in a smaller and smaller (diminishing return) revenue or marginal revenue.