If andrea sells dan a wii gaming system for $150,
a. the well-being of both parties will be unchanged.
b. andrea will gain from the transaction, but dan will lose.
c. dan will gain from the transaction, but andrea will lose.
d. both dan and andrea will gain from this transaction.

The answer is: D) both Dan and Andrea will gain from the transaction.

Explanation:

Whenever a business transaction is done freely, not forcefully, by mutual consent and without any type of fraud being committed, then both parties win. Andrea should be happy with her $150 and she will be able to buy anything she wants or likes (in the price range). Dan should also be happy and start playing with his Wii as soon as possible so he can enjoy the most out of his new purchase.

The only reason why someone would lose in this transaction is that Andrea was forced to sell her Wii at a lower price than she thought. Or Dan was forced to buy the Wii at a higher price than he considered appropriate. Or Andrea stole the Wii from someone else, it really doesn´t work or anything else illegal about it.  

a

explanation:

answer; common market;