http://www.muhlenkamp.com/investment/principles/whats_the_new_normal_economics_rules_markets
The map above displays the ISM Non-Manufacturing Index over a span of twelve years. The "50" marks a median for the graph and shows the decline in between the years 2001-2002 and 2008 and 2009. Instead of giving an absolute value this map gives a comparison which allows you to base your values and conclusions on, accurately making this a Index Value Plot.
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