36. Are birth rates for poor populations higher than for the wealthy? If so, what is a possible explanation? 37. How does schooling tend to vary by household income? Why might this be problematic for long-term poverty reduction? 38. What is "relative inequality" and how is it measured? How is relative inequality different to absolute inequality? 40. How do you measure real consumption per adult equivalent? What are some issues that should be considered when constructing an equivalence scale?