Equity Market Size, from anonymous
When searching for regularities, it may be helpful to start with things like this. This is a chart of the world's countries scaled by the size of the equity market.
One could look at many things including:
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Size: does big influence small or vice versa?
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Time Zone: is there a wave from the East, or have today's almost 24 hour markets mitigated this?
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Latitude or longitudinal prediction? Neither?
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Isolation from or clustering with other markets as a measure of under/over reaction?
Amongst much else.