Either.
You don't get my point. I know Long. My point is : What is the Long process in BitUSD? You buy BitUSD by what? Flat money or BitShare?
OK, Let discuss the two cases:
1. You buy BitUSD by USD.
Where is your BitUSD ? You have to generate them first, right? And in order to generate them someone else has to short BitUSD. Is that correct? If so, and there is no market-maker, if everyone thinks BitUSD will rocket into sky and no one short BitUSD, you can not generate BitUSD !
2. You buy BitUSD by Bitshare.
What will happen to the Bitshare?
Well, if there is demand for BitUSD then the value of BitUSD will rise VS the value of BitShares. Demand for BitUSD creates demand for BitShares and the ultimate result of demand for BitUSD is to drive the value of BitShares up and this is why someone would Short BitUSD. So the situation you are concerned about cannot happen.
When you buy BitUSD with BitShares... you simply trade with someone.
If the person you are buying BitUSD from is Short Selling it, then the BitShares go into escrow/collateral until the short is covered.
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