# Why does average total cost fall and then rise?

## Why does average total cost fall and then rise?

AVC is ‘U’ shaped because of the principle of variable Proportions, which explains the three phases of the curve: Increasing returns to the variable factors, which cause average costs to fall, followed by: Constant returns, followed by: Diminishing returns, which cause costs to rise.

## Why do the marginal costs fall at first and then later rise?

Marginal Cost. Marginal Cost is the increase in cost caused by producing one more unit of the good. At this stage, due to economies of scale and the Law of Diminishing Returns, Marginal Cost falls till it becomes minimum. Then as output rises, the marginal cost increases.

## What causes average cost curves to shift?

A technological change that increases productivity shifts the product curves upward and the cost curves downward. If a technological change results in the firm using more capital, the average fixed cost curve shifts upward and at low levels of output, the average total cost curve may shift upward.

## Why does the ATC curve start to go up after the MC curve crosses it?

This means that ATC has to go up because every new unit produced increases ATC. When we put this all together, it means that ATC decreases as MC rises to intersect with it. After they intersect, they both rise. This happens because MC is part of ATC.

## Why are average cost curve and marginal cost curve U shaped?

The average cost curve is u-shaped because costs reduce as you increase the output, up to a certain optimal point. From there, the costs begin rising as you increase the output. Average cost is defined as the total costs (fixed costs + variable costs) divided by total output.

## Why does the marginal cost curve cut the average cost curve?

When the MC is smaller the AC, the AC decreases. This is because when the extra unit of output is cheaper than the average cost then the AC is pulled down. Similarly, when the MC is greater than the AC, the AC is pulled up. The point of intersection between the MC and AC curves is also the minimum of the AC curve.

## Why does the marginal cost go down when the average cost is first going down?

Why does the marginal cost go down when average cost is first going down? because specialisation reduces the cost of production for each additional unit. This makes each additional unit of input produce less output, so once it comes into effect; the cost for each additional unit of output increases.

## Why does average variable cost increase?

The increase in AVC after a certain point is indirectly related to the law of diminishing marginal returns. The law states that at some point, the additional cost incurred to produce one more unit is greater than the additional revenue (or returns) received. At that point, the AVC starts to increase.

## What happens to average cost when marginal cost increases?

An increasing marginal cost curve intersects a U-shaped average cost curve at the latter’s minimum, after which the average cost curve begins to slope upward. For further increases in production beyond this minimum, marginal cost is above average costs, so average costs are increasing as quantity increases.

## Why is average variable cost curve U shaped Mcq?

Because the short-run marginal cost curve is sloped like this, mathematically the average cost curve will be U-shaped. Initially, average costs fall. But, when marginal cost is above the average cost, then the average cost starts to rise.

## Why is the average fixed cost curve not U shaped?

The average fixed costs AFC curve is downward sloping because fixed costs are distributed over a larger volume when the quantity produced increases. Variable returns to scale explains why the other cost curves are U-shaped. …