This blogger wrote about the function a while back:
“Short-sellers borrow shares and sell them at a high price, hoping to buy them back at a lower price in the future and reap a profit. Unlike stocks, which have a set number of outstanding shares, ETFs undergo a constant process of spawning more shares and taking others off the table.
Market makers in ETFs can create shares on the fly and can create shares for the express purpose of lending those for use by short-sellers.”
![Confused :%)](./images/smilies/wacko.gif)
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