South Africa's big three pathology groups, Pathcare, Lancet and Ampath, are expected to lower the price of Covid-19 Rapid Antigen tests to no more than R150 per test.

This is after a Competition Commission investigation found that the three groups may have contravened the Competition Act, which prohibits dominant companies from charging excessive prices to the detriment of consumers.

The commission's investigation was triggered by a complaint from the National Health Department, which alleged that a test kit bought through UNICEF costs only R50 - implying that the three companies may have been overpricing.

The companies were charging at least R350, with prices dropping to R250 during November.

Commissioner Tembinkosi Bonakele said the move is a further victory for consumers if taken in the context of last week's announcement that Covid-19 PCR tests will now cost no more than R500.

1. For Covid-19 Rapid Antigen testing, draw a graph to represent a price ceiling and discuss the concept of a price ceiling. (Explain the graph)