In the feature "Solar Power Learning Curves," the cost of solar power installations fell as the installed base (cumulative experience) in a given country rose. If N represents cumulative national experience, would an average cost curve AC = a + bN exhibit such learning by doing? Explain. (Note: a, b, and r are all positive constants.) First, note that, as a function of a, b, N, and r, dAC dN (Properly format your expression using the tools in the palette. Hover over tools to see keyboard shortcuts. E.g., a superscript can be created with the ^ character.) This indicates that learning by doing Vi (1,1) More