This is one of the best things about Bitshares DEX. You can make your own interest free credit in USD by putting BTS in collateral. Then, with your USD, you can buy more bitshares (or another crypto) at current price. If price of bitshares (or the crypto of your choice) goes up, sell it for covering your credit and keep profit for whatever you want (buying more BTS for example).
RE: BitShares (BTS) Short Term Target $0.52