At their disposal there is a large number of complex mathematical tools, most of which are the so-called lagging indicators, which are calculated on the basis of recent prices.
At onawo zabo kukhona ezihlukahlukene enkulu amathuluzi eyinkimbinkimbi zezibalo, eziningi zazo - okubizwa ngokuthi izinkomba okusalele emuva, okuncike amanani amuva.