Market concentration blunts rate transmission in South Africa
A South African Reserve Bank research note finds that market concentration in South Africa weakens monetary policy pass-through. Dominant firms exploit pricing power to raise food prices rapidly during cost shocks while delaying price cuts when input costs fall.
Asymmetric pricing across food chains
South Africa scored 2.83 in the 2023 OECD Product Market Regulation indicator, the highest among 51 surveyed economies.
The note details how structural concentration across food chains enables asymmetric pricing.
The relative price of food in the consumer price index basket increased 17 to 21 percent since 2014.
In the cooking oil sector, producer prices rose sharply in 2022 despite stable domestic seed costs, and retailers failed to pass late 2023 producer price declines to consumers.
Past cartel cases in wheat flour revealed markups between 7 and 42 percent above competitive levels, with administrative penalties exceeding 650 million rand across milling cartels.
Cash reserves insulate dominant firms
Monetary policy transmission relies on firms adjusting output and investment to changing borrowing costs.
However, dominant firms pricing above marginal cost hold large cash reserves and substantial borrowing buffers, insulating their production decisions from interest rate movements.
Rate hikes also raise entry barriers and borrowing costs for smaller rivals, reinforcing the market share of incumbents.
Consequently, rate tightening achieves weaker disinflationary effects in concentrated sectors.
Monetary policy cannot fix cartels
The analysis rightly identifies industrial bottlenecks that monetary policy alone cannot resolve.
However, recommending competition metrics for macroeconomic forecasting offers little practical relief to strained consumers.
Without aggressive structural enforcement by competition authorities, rate adjustments remain an inefficient blunt instrument.