Global stock markets are regularly seeing three-percent swings as investors grapple with worries about the euro zone debt situation and escalating tensions between North and South Korea.

The debt crisis is a game changer for the market and Europe is now at risk of heading into a double-dip recession, Arnab Das, managing director of market research and strategy at Roubini Global Economics told CNBC Monday.

XL Capital has been facing a negative trend recently, and yesterday the bears turned it up a notch.

In the investment strategist world, I tend to be pretty cautious. I do believe that while economies are recovering, it's going to be a long difficult climb from years of excesses.

Stock pared their earlier losses Monday, but investors are continuing to worry about the European debt contagion. Richard Sparks, senior equities analyst at Schaeffer’s Investment Research, and Jack Reutemann, founder of Research Financial Strategies, offered their insights.

The new SEC rules on the single stock circuit breakers were published today in the Federal Register. This now begins a 10-day public commentary period, which are due on or before June 3, 2010. Elsewhere, this has all the characteristics of a quiet summer day; but given the recent volatility, that is being greeted with relief rather than yawns.

Stocks wobbled in mid-afternoon trading Monday following a short-lived rally. How should investors position their portfolios? Mary Jane Matts, director of Fifth Third Asset Management, and David Spika, VP and investment strategist at WHG Funds, discussed their insights.

With one major banking crisis behind us, Monument Securities Chief Economist Stephen Lewis said investors only need to go back to 2007, rather than the Great Depression, for clues on how the current problems may play out.

The year-long uptrend in the stock market is over and commodities are also set to correct, according to Robin Griffiths from Cazenove Capital Monday. As a result, Griffiths suggests investors look for risk-averse trades.

Nearly every large-cap U.S. company has some form of exposure to Europe and some are significantly more at risk than others. So which ones are the most affected and by how much? Roberto Pedone, contributor at TheStreet.com shared his insights.

Investors can realize strong returns on municipal bonds and federally-instituted Build America Bonds (BABS), Pimco founder and co-CIO Bill Gross told CNBC Friday.

Markets are significantly undervalued in terms of corporate earnings, and stocks are set to bounce back with a vengeance, Christian Blaabjerg, Strategist at Saxo Bank, told CNBC Friday.