Since 13 February 2020, a dominant firm in a sector the Minister designates by regulation must not, directly or through others, demand or impose unfair prices or unfair trading conditions on a supplier that is an SME or an HDP-controlled firm (one that historically disadvantaged persons own or control), and must not stop or refuse buying from such a supplier to get around that rule (section 8(4)). Once a prima facie case exists, the burden shifts to the dominant firm to show the price or condition is not unfair, or that its refusal to buy was not a circumvention. The Minister's regulations designate the sectors, the benchmarks for identifying HDP-controlled firms and the factors for judging unfairness (the Buyer Power Regulations).
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.