A: Aggregate demand, or AD, is defined as the total amount of goods and services consumers are willing to purchase in a given economy and during a given time period. Sometimes aggregate demand changes in a way that alters its relationship with aggregate supply, or AS; this is called a shift..
The birth control shot, Depo-Provera, is a hormonal injection that prevents unplanned pregnancy for three months at a time. The hormone in this shot is progestin. The birth control shot works similarly to the birth control pill. It prevents ovulation and increases the mucus buildup around the opening of the cervix. According to Planned Parenthood, when you receive it as directed, the shot is 99 percent effective.
Both birth control pills and the Depo-Provera shot are very safe for most women to use. As with any medicine, they can still cause unwanted side effects. For birth control pills, side effects can include: breakthrough bleeding, or bleeding during active pill days.