20. You observe that rivalry within an industry is declining. Which of the following might be true:

	A.	Laws have been put in place that eliminate entry into the industry
	B.	Demographic changes has increased demand for the industries products
	C.	Some of the largest firms in the industry have acquired many of the smaller firms
	D.	Recent technological developments have lowered the price of substitute products
	E.	A, B, and C
	F.	A, B, and D
	G.	B, C, and D