An article in the Wall Street Journal notes that although U.S. oil production has increased rapidly in recent​ years, the increase has still amounted to only 5 percent of world production.​ Still, that increase has been​ "enough to help trigger a price​ collapse." ​Source: Georgi Kantchev and Bill​ Spindle, "Shale-Oil Producers Ready to Raise​ Output," Wall Street Journal​, May​ 13, 2015. A small increase in supply can lead to a large decline in equilibrium price when: