Just as on the demand side, the position of the supply can shift, say from a change in the price of a productive input or a technical improvement. The Law of Supply states that, in general, a rise in price leads to an expansion in supply and a fall in price leads to a contraction in supply.
Puberty takes place over a number of years, and the age at which it starts and ends varies widely. It generally begins somewhere between the ages of 7 and 13 for girls, and somewhere between the ages of 9 and 15 for guys, although it can be earlier or later for some people.
Except when do guys stop growing, the following FAQs about growth may arouse your interests. Mostly, girls reach their maximum height during the growth spurt that takes place right before the onset of menstruation. Most girls get their very first period when they are 12 or 12 years old. Once they begin menstruating, they gain about 1 to 2 inches in their height and reach their complete adult height when they are 14 or 15 years old. However, the puberty age for girls varies a lot. Some girls hit this point when they are 8 years old while other might hit this growth spurt when they are 14 years old.