the leading one involves products from both in the united states, bristol meyers, and gillian. so it's hard to know, are they partners or are they competitors? and the prices would suggest they're more like partners than competitors. >> two comments i want to add. i think we're right thinking about this as an experiment, and thinking about how we can develop a better innovation system, not just for aids, but for health and beyond health for research more broadly. and i just wanted to reiterate that in thinking about the innovation system, there are a couple of other parts. the patent system will continue to play some role in, for instance, idea that's we haven't even thought about. in health, the price system is particularly well suited because we have a more well formulated notion of what we need. and, therefore, if it's particularly effective in that area, the mother areas where climate change, if it can be particularly effective, we know what we need in terms of the more efficient batteries. so there are certain areas where the prices are very well suited, other areas where