HHI

HHI stands for Herfindahl–Hirschman Index or shorter, Herfindahl Index, a measure of market concentration.

Context

 * Diversification of oil import sources: HHI, calculated as the sum of the squared market shares of countries of origin
 * Diversification of the energy mix: Herfindahl Index over natural gas, total petrol products, nuclear heat, renewable energies and solid fuels