An economy can be defined as “specialised” if a few sectors account for a relatively large share of the country’s GDP, whereas it is “diversified” if each of a relatively high number of sectors accounts for a small share of GDP. Industrial specialisation or diversification patterns relate to economies’ long-run productivity, resilience to a crisis, investment patterns, innovativeness and performance of firms and sectors. The Hannah-Kay (HK) diversification index captures a country’s full sectoral composition and accounts for the influence of larger sectors. A lower HK corresponds to rising sectoral specialisation. The concentration ratio (CR) index shows the share of value added accounted for by the economy’s top four sectors.