Whenever Mr. Market wants to change something, he can turn the dials pretty swiftly and cause prices to move significantly. The speed and the magnitude of the changes are often greater than many investors realize while the price adjustments are occurring.
Oil provides a good example. At the end of last June, oil traded at $105.37 per barrel. Over the next three months, the price declined to $91.16. Then, in the fourth quarter, oil plunged by more than 41% to $53.27 on December 31, 2014. Oil has continued to fall this month, trading at $46.50 per barrel today. Put another way, oil has fallen by 56% since the end of June and 49% during the 16-week span starting at the end of September.