Which of the following is NOT consistent with what we learned in the course?

	a.	Constant returns to scale denote a case where a change in all inputs leads to a proportional change in output.
	b.	Economies of scope occur when a number of different products can be produced more efficiently together than apart.
	c.	Decreasing returns to scale occur because of the law of diminishing returns.
	d.	Increasing returns to scale are also called economies of scale.