Explain it clearly and need only typed answers

Thank you

As a firm starts up and gets larger, it typically experiences:

options:

	constant returns to scale at all levels of output and firm sizes.
	constant returns to scale, followed by economies of scale, and then diseconomies of scale.
	diseconomies of scale, followed by constant returns to scale, and then economies of scale.
	economies of scale, followed by constant returns to scale, and then diseconomies of scale.

If a firm confronts constant returns to scale, each one percent increase in all resources expands output by:

options:

	precisely one percent.
	more than one percent.
	more than the increase in total costs.
	less than one percent.

A firm that increases all inputs by 10% but generates only 5% more output is experiencing:

options:

	economies of scale.
	diseconomies of scale.
	constant returns to scale.
	increasing marginal disutility.