The index value represents consensus forecast value. The consensus forecast is calculated as the median value. The forecasts of market participants for the last 28 days, including the calculation date, are included in the calculation. The most recent forecast from each participant is taken into account in the calculation. Base Asset – Copper (World Bank). Copper (World Bank) is a commodity index reflecting the settlement price on the London Metal Exchange for high-purity cathodes and wire bars, used as a benchmark in metallurgy and electrical engineering.