So you mean buying BitShares equals short BitAsset?
If so, assume there are 32 kinds of BitAssets and each is pegged to different asset, then what is the rate?
They are market pegged each BitAsset class floats against BitShares based upon supply and demand factors alone. Of course BitUSD can only be borrowed into existence and is destroyed when the loan is repaid to the blockchain.
The total bitshare is LIMITED, so I wonder your backup will be insufficient unless 1 BitShare can support multiple BitAssets.