A sweeping, definitive review of what works and what doesn’t in reducing inequality and boosting the incomes of the poorest in developing countries, drawing on evidence of a half-century of work by the World Bank Group. It will include our first-ever numbers on how 89 countries are faring in boosting the prosperity of the poorest 40 percent. The speech also will highlight what specific programs opened the way for the bottom 40 percent to have more economic opportunity and narrow the income gap with the wealthiest – lessons that could apply to all countries battling inequalities, both rich and poor.