In the small agricultural supply shops that dot the landscape of Tanzania’s Morogoro region, a quiet economic drama is unfolding with consequences that reach far beyond the shop counter. Smallholder farmers across sub-Saharan Africa adopt modern agricultural inputs, including fertilizer, at persistently low rates, and that reluctance translates directly into low agricultural productivity. Previous research has pointed to insufficient information and distrust in the quality of products sold in local markets as key reasons why farmers hold back from purchasing and applying fertilizer. Now, a new study from researchers at the University of Illinois Urbana-Champaign, published in the American Journal of Agricultural Economics, has documented a previously underappreciated mechanism behind these stubborn perceptions: the remarkably high rate at which local agro-dealers enter and exit the marketplace, and the way that churn shapes what farmers believe about the products they are being asked to buy.
The study, titled Firm Turnover Under Asymmetric Information: Tanzania’s Agro-dealer Sector, was led by corresponding author Alix Naugler, who conducted the research as a master’s student in the Department of Agricultural and Consumer Economics at Illinois and is now pursuing a doctoral degree in applied economics and management at Cornell University. She worked alongside co-authors Hope Michelson, professor of agricultural and consumer economics at Illinois, Sarah Janzen, an associate professor in the same department, and Christopher Magomba, a professor at the Sokoine University of Agriculture in Tanzania. The team draws on a decade of field research in Morogoro, during which Michelson’s group has repeatedly surveyed agro-dealers, sampled and tested their fertilizer, and gathered detailed information on soil quality, farmer production systems, and farmer perceptions of agricultural inputs.
The starting point for the research is a well-established puzzle in development economics. Agricultural inputs are what economists call experience goods: their quality cannot be verified at the moment of purchase, and only reveals itself after use. For fertilizer, the lag is especially long, because the plant’s agronomic response to application becomes observable only over time, sometimes several months after the product has been bought and spread on a field. In markets characterized by such information asymmetries, economists have shown that consumers tend to rely heavily on the reputation and trustworthiness of sellers as a proxy for the unobservable quality of the product. Michelson explains that in these settings, the identity and continuity of the seller matter enormously, because a farmer has little else to go on when deciding whether a bag of fertilizer contains the nutrients it claims to contain.
Herein lies the puzzle that motivated the study. A common perception among smallholder farmers in Tanzania, as in other parts of the world, is that fertilizer for sale in local markets is of bad quality, missing important nutrients that lower its agronomic effectiveness. Yet independent testing across multiple studies and laboratories shows that fertilizer sold in the region is consistently of good quality. The mismatch between belief and measured reality is not a minor footnote; it is a persistent and important challenge for both policy and research, because farmers who distrust the product on offer will rationally choose not to buy it, depressing adoption rates even when the underlying supply chain is delivering exactly what it promises.
Over years of returning to the same markets, the Illinois team noticed something unusual: agro-dealers were exiting the market at a striking rate, higher than other small businesses operating in the same region. That observation prompted a systematic investigation. Naugler set out to document the rates of agro-dealer turnover and to benchmark them against what is observed among micro and small enterprises in other developing countries, to understand the drivers and motivations behind the high entry and exit rates, and to explore whether a systematic relationship exists between agro-dealer turnover and farmer beliefs about fertilizer quality in these markets. Field work in Tanzania was conducted with local collaborators, and the researchers traveled across the region to speak with farmers and agro-dealers, supplementing in-person visits with phone surveys of agro-dealers already in the team’s database from previous studies.
The numbers the team documented are remarkable. Annual agro-dealer entry rates in the study region reached 33 percent, while exit rates reached 17 percent. Both figures are more than double the typical turnover rates for non-agricultural micro and small enterprises in low-income countries. In practical terms, roughly one in three local input shops is new in any given year, and one in six disappears. For a market in which trust is the primary currency, that level of churn is not a neutral background condition; it is a structural feature that continuously resets the relationships between sellers and the farmers they serve.
Why are so many shops opening and closing? One plausible hypothesis was that agro-dealers enter the market only when they have no better options and exit when a new opportunity arises, treating the business as a backup strategy for earning income. The survey data showed something very different. Janzen describes the agro-dealers in the sample as optimistic entrepreneurs: they are educated and trained in the agricultural sector, and they enter with the intent to operate for the long run. They want to sell agricultural inputs to smallholder farmers. But strong competition is driving them to exit at high rates. In other words, the churn is not a symptom of half-hearted commitment; it is the outcome of intense rivalry among serious, well-prepared business owners competing for a limited customer base.
The connection between this turnover and farmer beliefs emerged clearly from the survey scenarios the researchers designed. They asked each farmer to rate the agricultural input quality of their current agro-dealer, and then asked about the expected quality of a hypothetical new market entrant. The results reveal a sharp asymmetry. Farmers who usually purchase agricultural inputs from the same agro-dealer have an established relationship and trust that seller. However, those same farmers expect new market entrants to provide lower-quality agricultural inputs. Trust, in this market, is specific to the individual seller and does not transfer to newcomers, no matter how qualified they may be.
Even more counterintuitive is what farmers believe happens when an agro-dealer exits. The researchers found that when dealers leave the market, farmers expect overall fertilizer quality in that market to improve. The interpretation offered by the team is that farmers believe bad agro-dealers, meaning suppliers of low-quality products, are the ones leaving. This belief persists in spite of the research showing that there are no bad agro-dealers in the sense of selling bad fertilizer; laboratory testing has repeatedly confirmed the products are sound. But the incorrect perceptions among farmers continue to persist and evolve, fed by the visible dynamics of the marketplace rather than by the invisible chemistry of the fertilizer itself. As Michelson notes, farmers cannot observe fertilizer quality at the point of purchase, so they use the information they observe in their own markets about agro-dealer operations to inform their beliefs about quality, and this has consequences for which agricultural inputs they choose to purchase and adopt.
The findings point toward an important but often overlooked role for agro-dealers in the agricultural development landscape. These businesses are not merely retail outlets; they also provide information and guidance for farmers, complementing the efforts of government extension services that are under-resourced and over-extended. Agro-dealers share agricultural information with farmers, including which brands to use and how to apply the product. Naugler concludes that ensuring these businesses are financially sound, and that they have the technical expertise to serve farmers locally, can ultimately strengthen agricultural productivity in the region. The policy implication is subtle but significant: interventions aimed at raising fertilizer adoption may need to look beyond product certification and pricing, and instead address the stability and continuity of the retail relationships through which farmers learn to trust what they buy. In a market where quality is invisible until months after purchase, keeping trusted sellers in business may be as important as keeping bad fertilizer off the shelves, especially when the evidence suggests bad fertilizer was never there to begin with.
Subject of Research: The relationship between agro-dealer market turnover and smallholder farmer fertilizer quality perceptions and adoption in Tanzania
Article Title: How high turnover rates in Tanzania’s agro-dealer sector affect farmer fertilizer adoption
Article References: How high turnover rates in Tanzania’s agro-dealer sector affect farmer fertilizer adoption. (n.d.). Original publication
Image Credits: AI Generated
DOI: Not provided
Keywords: agro-dealers, fertilizer adoption, Tanzania, smallholder farmers, information asymmetry, market turnover, agricultural economics, Morogoro, product quality perceptions, sub-Saharan Africa, trust, American Journal of Agricultural Economics
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Alan Morgan. (October 4, 2026). High Agro-Dealer Turnover in Tanzania Undermines Farmer Trust and Fertilizer Adoption. Scienmag. https://scienmag.com/high-agro-dealer-turnover-in-tanzania-undermines-farmer-trust-and-fertilizer-adoption/
Alan Morgan. “High Agro-Dealer Turnover in Tanzania Undermines Farmer Trust and Fertilizer Adoption.” Scienmag, 4 October 2026, https://scienmag.com/high-agro-dealer-turnover-in-tanzania-undermines-farmer-trust-and-fertilizer-adoption/. Accessed 4 October 2026.
Alan Morgan. “High Agro-Dealer Turnover in Tanzania Undermines Farmer Trust and Fertilizer Adoption.” Scienmag. October 4, 2026. https://scienmag.com/high-agro-dealer-turnover-in-tanzania-undermines-farmer-trust-and-fertilizer-adoption/
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Tags: agricultural economicsAgricultural input market dynamics in Tanzaniaagricultural supply chain challenges in sub-Saharan Africaagro-dealer business turnover impactagro-dealer exit and entry effectsagro-dealersAmerican Journal of Agricultural Economicsasymmetric information in agricultural marketseconomic implications of agro-dealer sector volatilityfarmer trust in fertilizer qualityfertilizer adoptionfertilizer market stability and farmer decision-makingimpact of market churn on agricultural productivityinfluence of local agro-dealer practices on farmer perceptionsinformation asymmetrymarket turnoverMorogoroproduct quality perceptionsrole of agro-dealer reputation in fertilizer adoptionsmallholder farmer fertilizer adoption barrierssmallholder farmerssub-Saharan AfricaTanzaniatrust
