World stocks retreated further from last week’s 11-month high on Monday as lower energy and commodity prices and caution ahead of a Federal Reserve meeting and G20 summit prompted investors to trim risky trades.

Leaders of the Group of 20 meet on Thursday and Friday in Pittsburgh and U.S. President Barack Obama said on Sunday he would push world leaders for a reshaping of the global economy in response to the crisis.

World stocks, measured by MSCI have risen over 26 percent this year, recouping more than half of last year’s losses, underpinned by repeated pledges by G20 policymakers to keep emergency support for the economy in place.

“The market might look slightly overbought near term, but the economy is definitely improving, corporate profits are definitely improving, interest rates are staying low, valuations aren’t expensive,” said Nick Nelson, European equity strategist at UBS. MSCI world equity index <.MIWD00000PUS> fell 0.7 percent, while the

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Commonly seen as a move countering rival Hewlett Packard's (HPQ) acquisition of EDS back in May, this morning Dell, Inc. (DELL) announced it will buy Perot Systems (PER) for $3.9 billion -- $30 per share of Class A common stock. Perot Systems was founded by former presidential candidate Ross Perot in 1988; Perot founded EDS a quarter-century earlier. The price tag amounts to a 68% premium in PER shares from Friday's close, and today the stock is trading accordingly -- up nearly $12 per share so far this morning. As for DELL shares, the tech giant is down over 5% at this point today, perhaps on concerns about the price and/or the nuts and bolts of implementing Perot Systems into Dell's technology services group. It had been increasingly clear that Dell would need to make some sort of move to stay competitive with global ...