3. Why are people who are unemployed but not looking for work not included in the

Because they don't keep track on it.

Explanation:

Basically they are just included in it because they don't keep track of it. Hope that helps!

The feature that is common to both stocks and bonds is FACE VALUE.
For stocks, face value represent the original cost of the stock, which is shown on the certificate. For bonds, the face value refers to the amount paid to the holder at maturity. 
Thus closing price and face value are the features of stocks while coupon rate, maturity date and face value are the features of bonds.