比方说华尔街银行的某个模型评估下来,承担两个不同日期交割的同一种证券的合约差价的风险,是简单持有这两个证券合约中一个的1/20。那么,if you arbitrage (long one and short the other) the same underlying instrument of 2 differnt delivery dates,chances are you can be financed (or leveraged) 20 times more than if you put on a naked position in either of the contracts of the 2 deliveray dates.
However, leverage magnifies risk factors, and one really has to know what he's doing.