John Murphy has written extensively about Intermarket Analysis - the study of the key relationships between the four major financial markets and how those markets affect each other in the long run. To study Intermarket relationships we use our Intermarket PerfChart that displays the percent performance of the major index for each of the four markets - $SPX for stocks, $CRB for commodities, $USB for bonds, and $USD for the US Dollar.
http://stockcharts.com/help/doku.php?id=support:chartwatchers
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