That's true to a certain degree. While most markets will fall at the same time - they would NOT recover at the same time... For example, see this graph
http://stockmarketalmanac.co.uk/wp-content/uploads/2014/01/FTSE-100-v-SP-500%C2%A3-v-GOLD%C2%A3-1984-2013.png
Also, as Dorin has shown, there is...