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Rui: Thanks for your questions, and for reading this blog "almost religiously". On the first, a negative vulnerability indicates that the country, such as Angola, benefits from an increase in oil prices because it produces more than it consumes. On the correlaion of vulnerability and other KPIs, it's complicated. For low income countries, with economic growth, there is usually an increase in vulnerability as the economy becomes more diversified. However, at higher incomes, countries reduce their vulnerability with income growth as they switch to less oil-intensive technologies. Similarly, your last question is a good one. High vulnerability is not necessarily a bad thing, because it signals the economy has evolved. On the other hand, it does leave the country susceptible to a sudden increase in oil prices. Shanta