Students learn in microeconomics that the demand curve for a good, which shows the relationship between the price of a good and the quantity of the good that consumers demand-i.e. are willing, ready, and able to purchase-has a negative slope.
The UNICEF estimates that an average of 353,000 babies are born each day around the world. The crude birth rate is 18.9 births per 1,000 population or 255 births globally per minute or 4.3 births every second (as of Dec. 2013 estimate).
According to the U.S. Center for Disease Control and Prevention, there are 3,952,841 babies born annually in the United States, equalling about 10,829 births daily. In the United States, this birth rate equals 12.6 births per 1000 people annually.