A major source of inefficiency in barter economies is that they ...

[tingc95]

A major source of inefficiency in barter economies is that they require
 
  A) a standard of deferred payment to make trade possible.
  B) more liquid stores of value than do monetary economies.
  C) a double coincidence of wants in exchange.
  D) All of the above are correct.

Question 2

What is an economic variable? Give an example of an economic variable.
 
  What will be an ideal response?

[bookworm410]

Answer to Question 1

C

Answer to Question 2

An economic variable is something measurable that can have different values, such as the wages of software programmers. (Students will give many different examples.)