I recently tweeted a chart showing the long-term trend of South African maize prices. The message was that the price of a tonne of maize was about 60% lower year on year in July. This was thanks to good summer rain, which led to a record maize harvest. The question by folks on Twitter was whether the price decline had been passed on to the end-consumer. The answer is only partially yes, since the price of a product such as 1kg of maize meal has declined only about 7% year on year. There are a number of reasons for the stickiness of maize meal prices. Farmers do not necessarily produce food products, but agricultural commodities. There is, therefore, a processing time lag between the farm gate and the retail level that includes costs such as labour, transport and processing. This processing chain typically explains the delays in price transmission between agricultural commodity prices and the food products. Regarding maize meal, the lag could be three to six months.A study published ...

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