Even with a margin [of...
Even with a margin [of safety] in the investor's favor, an individual security may work out badly. For the margin guarantees only that he has a better chance for profit than for loss - not that loss is impossible. But as the number of such commitments is increased the more certain does it become that the aggregate of the profits will exceed the aggregate of the losses.
Added on: November 16, 2008
This is the source.
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