Answer:
Breast development has not occurred by age 13
Explanation:
Delayed puberty is a condition under which secondary sexual development which includes breasts in girls, underarm hair and sexual desire in both sexes, etc are delayed. The reason can be varied from family history to medical conditions (for example asthma, kidney diseases, diabetes, etc). One of the treatment of delayed puberty is hormone therapy.
A giffen good is a good whose demand rises when the price rises, which is opposite to the laws of demand because the laws of demand state that a rise in price will result in a reduction of demand. An example can be a staple food like bread. If the price of bread rises, people will buy it more because they'll have to cut back on other more expensive things, of course this applies in theory.