Hello! I need help answering these questions. I need a brief xxplanation of why they are either true or false please. Thank you

4. Resale price maintenance prevents retailers from competing on price. True, because price gives surety to the buyer that company will buyback at least this price 5. As the number of firms in an oligopoly increases, the magnitude of the price effect increases True 6. One way that public policy encourages cooperation among oligopolists is through antitrust law. False 7. When firms form a cartel in an oligopoly market, the total output is always the same as if the market were perfectly competitive. False 8. Cartels with a small number of firms have a greater probability of reaching the monopoly outcome than do cartels with a larger number of firms. True 9. The notion of a tit-for-tat strategy applies to a prisoners' dilemma game that is played repeatedly, but it does not apply if the game is played only once. True 10. A group of firms that collude is called a cartel. True