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What will cause the next market wobble?

Global markets are starting the week with fresh developments in three of the biggest catalysts spearheading volatility: China, the Federal Reserve and Greece.

Reports that Beijing will abandon its controversial large-scale share purchases spooked Asian markets on Monday and pushed Shanghai stocks 3 percent lower. Suspected government purchases of blue-chip stocks have been vital to the stabilization of A-share markets in recent sessions and investors are afraid further declines could follow if the reports are true.

"As soon as people sense the government's resolve to hold up the market is weakening, investors will dump stocks," David Cui, head of China equity strategy at Bank of America Merrill Lynch, told CNBC on Friday.

Read MoreVolatility will be high this week, based on these numbers

Meanwhile, the timing of the first U.S. interest rate hike remains a guessing game after Federal Reserve Vice Chairman Stanley Fischer told CNBC at the Jackson Hole symposium at the weekend that it was too early to tell whether the case for action in September was compelling.

Finally, troubled Greece is preparing to hold its fifth general election in six years early next month. Vassiliki Thanou, president of the country's Supreme Court, was sworn in as the first female prime minister in the nation's history on Friday, so she can head a caretaker government following the resignation of Alexis Tsipras last week.

Which one of these do you think will hurt markets the most? Vote in our new poll.

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