A new firm successfully enters a three-firm Cournot Oligopy without changing the demand and cost structures. The new price becomes?

When a new firm successfully enters a three-firm Cournot oligopoly, the number of firms in the market increases to four. This typically leads to an increase in total quantity produced, which results in a decrease in the market price, assuming demand remains constant. The new equilibrium price will be lower than the previous price set by the three firms, reflecting the increased competition and supply in the market. As a result, all firms may experience reduced profits, depending on their cost structures.