Ribavirin has weak but well-established efficacy as an HCV anti-replication agent; it typically produces a mean of ~0.8 logs of viral reduction when used as monotherapy. (Source: various CC’s from such companies as GILD, ANDS, VRUS, and IDIX.)
“The efficient-market hypothesis may be the foremost piece of B.S. ever promulgated in any area of human knowledge!”