Market sentiment on General Electric Co. deteriorated further Monday, with the stock sliding and the cost of protecting against default on GE debt climbing, even as the conglomerate moved to reassure nervous investors.

GE posted an unprecedented "investor update" on its Website Sunday, reiterating among other things that it has no need to raise outside capital and that it has "an unwavering commitment to maintaining our Tripe A" rating, which is the highest.

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