. No firm should earn an economic profit.2. Monopolists always charge the highes

. No firm should earn an economic profit.2. Monopolists always charge the highest price possibleand earn short run economic profits.3. The defining characteristic of oligopoly is that each firm is mutually interdependent.4. A firm should shut down in the short run if price is less than average fixed costs.5. A price discriminating monopolist charges the same price to everyone. (Be sure to point out that a price discriminating monopolist must be the only seller in the market.)6. There is no reason for a firm in a monopolistically competitive market to advertise and advertising has nothing to do with promoting non-price barriers.I need a explaintion on each topic . This is due at 11am friday. This is for 4 points and I need them all.