How might differential costs analysis be used in the following non$-$routine decisions: expanding an existing service, decreasing an existing service, starting a new service, and closing an existing service?

Include in your answer the following:

What happens to the existing fixed cost structure in decreasing an existing service?

At what point will volume drive the revenue in order to cover the fixed costs in starting a new service?

What happens to the existing fixed cost structure when closing an existing service?