Answer:
5%
Explanation:
Purchasing power refers to the amount of goods and services a unit of currency can buy.
Purchasing power can be determined by finding the real interest rate. 
Real interest rate = Nominal interest rate - inflation rate 
 10% - 5% = 5%
I hope my answer helps you 
 
        
             
        
        
        
Yes u can get negative cost of equity
        
                    
             
        
        
        
Answer: Marginal revenue is equal to price times quantity
Explanation:
A perfectly competitive market is a market where there's a large number of both the producers and the consumers have full and symmetric information.
In a perfectly competitive market, the marginal revenue is the same as price and the marginal revenue curve is the same as the demand curve facing sellers.
It should be noted that the statement that the marginal revenue is equal to price times quantity is incorrect. The total revenue is equal to price times quantity.