Suppose There Are Only Two Firms in an Industry,and Their

Suppose there are only two firms in an industry,and their products are perfect substitutes for each other.Each firm had a fixed marginal cost of $5,and zero fixed cost of operation.The highest the consumers of this product are willing to pay for it is $10,and there are 200 consumers in this market.The two firms agree to collude and come up with a pricing scheme that maximizes their joint profit.The agreed-on price of this collusion will be ________,and this collusion is ________.

A) $10; unstable
B) $10; stable
C) $5; unstable
D) $9.99; stable