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).
With all of those combined, the U.S. is expected to add one person to the population every 17 seconds. The world population will increase even more, to 7,295,889,256, which is a 1.08 percent increase from Jan. 1, 2015. Worldwide, there will be 4.3 births and 1.8 deaths every second during January 2016.