The analysis of the general Cournot model shows that the reason for strengthening, instead of
dissecting, the Bertrand s paradox lies in that its assumed preconditions are far away fromthe real economic
conditions. For this reason, the assumed preconditions were modified as follows: the cost of oligopoly
manufacturers entering a professional market increases continuously and the marginal cost of products does
not equal zero. Through rigorous mathematical deduction, the following conclusionswere drawn,i.e., the
numberof oligopolies is limited by the increasing cost-of-entry, the market capacity is decreased by the
existence of the marginal cost, and oligopolistic competition will not result in perfect competition easily.