An agreement between two duopolists to function as a monopolist usually breaks down because
a.
they cannot agree on the price that a monopolist would charge.
b.
each duopolist rationally wants a larger share of the market in order to capture more profit.
c.
each duopolist irrationally wants a larger share of the market in order to capture more profit.
d.
each duopolist wants to charge a higher price than the monopoly price.