give correct answer and explain it

If you look at the graph of a perfectly competitive firm and see that it has an economic profit, you know the graph is of the short run. However, when you look at the graph of a monopoly and see that it has an economic profit, you are unable to tell if the graph is of the short run or the long run. True O False Question 12 According to the law of demand, an increase in the price of gasoline will cause a decrease in the demand for gasoline. True False Question 13 In which market structure can a firm never use price discrimination to increase its profit? O perfect competition monopolistic competition monopoly O oligopoly