... − − 18 602.The change in profit with respect to QD is∂ π∂ DDD OQQ Q= − 18 2.To determine the profit-maximizing quantity, set this derivative to zero and solve for QD: 18 - ... = 6 and profit is 26. Consumer surplus is(0.5)(20 - 14)(6) = $18. Social welfare is the sum of consumer surplus plus profits, or 18 + 26 = $44.With entry, social welfare is $32 (consumer surplus) ... combination of decisions leads to the following “ratingspoints” results:Network 2First SecondFirst 18, 18 23, 20Network 1Second 4, 23 16, 16a. Find the Nash equilibria for this game, assuming that...