1. Product differentiation by incumbents act as an entry barrier because __________
a. new entrants cannot differentiate their products
b. incumbents will take legal action if new entrants do not differentiate their products
c. new entrants will have to spend heavily to overcome existing customer loyalties
d. it helps a firm to derive greater economies of scale
2. A supplier group would be most powerful when _________
a. there are many suppliers
b. there are few substitute products
c. there is a low differentiation of products supplied
d. there is a high threat of backward integration by the buyers