It takes liquidity to make a market successful, and it can be difficult to get a new one started until it achieves a certain critical mass. The problem may be that there are not many investors who want to take a long position on oil and Nigerian credit risk simultaneously.
流动性是市场成功必不可少的要素，一个市场要成功，就必须超过某个临界规模。问题可能在于，愿意同时持有原油和尼日利亚信用风险多头头寸的投资者不够多。