我刚看即时报价
vxx(iPath® Series B S&P 500® VIX Short-Term Futures™ ETN )
50.20-0.40 (-0.79%)
tvix(VelocityShares Daily 2x VIX Short-Term ETN)
373.54-2.46 (-0.65%)
tvix是追踪两倍的怎么反而跌幅比较少?是溢价的关系吗