Tanzanian fertilizer shops turn over at twice the rate of other small firms in low-income countries

A 17% annual exit rate limits how long any one shop is around to be judged. Hold that rate steady and assume nobody re-enters, and 0.83 cubed leaves 57 of every 100 dealers trading after three years, so about 43 have gone ^[15]. How much that matters depends on how slowly the product reports back. "Agricultural inputs are experience goods: you don't know if a product is of good quality until after purchase and use," said Hope Michelson, a professor of agricultural and consumer economics at the University of Illinois Urbana-Champaign and a co-author. "For fertilizer, you might not know for several months because the plant's agronomic response to the application only becomes observable over time" ^[4].

Both figures are reported as annual rates. Taken against the same stock of shops, entry at 33% exceeds exit at 17% by 16 points a year ^[2][14]. So a farmer walking into a market meets a growing number of counters, a large share of them new. Combined entry and exit of 50 points against a benchmark the researchers describe as less than half that puts typical churn among nonagricultural micro and small enterprises in low-income countries below 25 points ^[3][16].

The belief the turnover is supposed to explain is well documented and, on the laboratory evidence, wrong. Smallholders in Tanzania commonly hold that the fertilizer for sale locally is of poor quality and short of important nutrients ^[6], while independent testing across multiple studies and laboratories has found the fertilizer sold in the region consistently good, according to Michelson ^[5]. Earlier work had put low adoption down to thin information and distrust in local product quality ^[13].

Alix Naugler, the corresponding author, said the team "set out to document these rates of agro-dealer turnover and to benchmark them against what we observe in other developing countries among micro and small enterprises" ^[8]. Naugler did the fieldwork with local collaborators including Christopher Magomba of Sokoine University of Agriculture, and the team also ran phone surveys with dealers already in its database from earlier studies ^[10][12].

The survey answers rule out the tidiest explanation for churn this high: fallback businesses run by people waiting for a better option ^[17]. Naugler said the dealers in the sample "are educated and trained in the agricultural sector, and they enter with the intent to operate for the long run" ^[7].

The design cannot settle direction. The published summary of the paper does not give the size of the estimated relationship between turnover and farmer beliefs ^[1]. Distrust can shorten a shop's life through weak sales as easily as a short-lived shop can leave distrust unresolved, and repeated rounds of surveys in the same markets do not separate the two. Michelson's team has been sampling and testing fertilizer in Morogoro for a decade, returning to the same markets each time ^[9][11].