1. The U.S. dollar rose to fresh three-month highs against its Canadian counterpart on Tuesday, as the greenback remained broadly supported by concerns over a potential Greek exit from the euro zone and as downbeat Canadian data dampened demand for the local currency.
2. U.S. stocks opened higher before quickly reversing course on Tuesday morning, setting the stage for another volatile session as investors await the outcome of a euro zone summit that will attempt to find a solution to the ongoing debt crisis in Greece.
3. China's stock markets are in trouble. The Shanghai Composite Index has fallen over 25% since mid-June. The Shenzhen, which has more tech companies and is often compared to America's Nasdaq Index, is down even more.
4. Oil prices plunged nearly 8% and broke below $53 a barrel on Monday, the deepest plunge for crude oil since early February.
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