C.
Allocative efficiency in simple terms basically means there is no wastage, therefore if producers produce at price equals marginal coat, they are producing at the point where consumers are willing to pay that final price. Refer to the poorly drawn diagram for reference.
 
        
        
        
Answer:
Countries that are open to international trade tend to grow faster, innovate, improve productivity and provide higher income and more opportunities to their people. 
Explanation:
Trade is central to ending global poverty.  Open trade also benefits lower-income households by offering consumers more affordable goods and services.
Hope this helped!!!
 
        
             
        
        
        
Answer
The answer and procedures of the exercise are attached in the following archives.
Step-by-step explanation:
You will find the procedures, formulas or necessary explanations in the archive attached below. If you have any question ask and I will aclare your doubts kindly.  
 
        
             
        
        
        
Answer:
c. governments that print too much money
Explanation:
In the long run, increase in money supply causes inflation. Since there are more money circulated in the market than the needs for transaction, inflation (an increase in prices) will be rise inevitably.
The government print too much money when they borrow to much or cannot pay their loans. The government finance its policies by tax and borrowing (issuing the government bonds), when the tax is not enough, the will issue bonds. If the due comes and they do not have enough money, they may force the central bank to print more money to pay their loans or buying their own bonds. This causes the rise of money supply resulting in inflation in the long run. Bolivia is an example of this situation.