Comment on the high cost of prescription drugs, investment in R&D by pharma, and whether policies to reduce pharma prices will have an impact on technology and quality of life. Do you think Medicare should be able to use market power to lower the price of prescriptions? Should high-income countries that are most likely to develop a vaccine to COVID-19 enjoy the benefits of that vaccine over low-income countries? How would you spur investment in a vaccine and allocate it across countries?