The global market sectors and correlation groups in the 2013–2017 daily close value. (a) All 51 futures instruments in the global market and the sectors belong to those instruments. (b) The highly correlated instruments group (σ < −0.75 and 0.75 < σ). (c) The moderately correlated instruments group (−0.75 < σ < −0.5 and 0.5 < σ < 0.75). (d) The low correlated group (−0.5 < σ < −0.25 and 0.25 < σ < 0.5).