Dr. Rafael Fonseca, a hematologist and oncologist at the Mayo Clinic, explains why the value of some prescription medications justifies a much higher price tag than other drugs used to treat the same problems.  Dr. Fonseca also discusses how the vast majority of patients have access to the better medications at greatly reduced costs and the frustrating pressure placed on doctors to try cheaper but less effective medications to save money.  He also tells us why robust competition is the best way to develop excellent medications at the lowest possible prices.