dr. peter bach from memorial sloane kettering penning an op ed saying the government should buy gilead. sts dropped from 42,000 to 15,700. dr. peter bach joins us here. explain more about this. >> nationalizing gilead. that's your idea for bringing down drug costs? >> it may seem unusual. the reality is we're not getting there on help piet tis b. the number of new patients starting on the treatment is falling every week. we've only treated 600,000 of 3.3 million with the infection. we need a way to provide an adequate supply at an affordable level. it actually works to have the u.s. government buy from the shareholders at a proper premium and sell off the parts that aren't needed for treating help c patients. >> what's gilead's market cap? >> about 100 billion. >> 100 billion and a debt. >> well over $100 billion outlay. you'd sell off some parts aside from the hepatitis business. but does this assume that the government would otherwise be paying for all of the drug treatments that now are going to gilead? is that the only way the math works for the government? >> the math works for the