Over the last few decades, the world’s capacity to produce food has been improved by innovations in the field of agricultural science: a meta-analysis of 147 studies found, for instance, that the adoption of genetically modified crops increased yields by 22 percent on average (Klümper & Qaim, 2014). In spite of this improved productive capacity, however, hunger remains a major challenge globally. Greater supply, it seems, does not necessarily produce meaningful access. Though adequate production remains essential to solving the problem, the solution cannot be realised by solely focusing on output. With this in mind, the first section of this essay examines how failures of distribution prevent food from reaching particular communities, before the second considers the separate problem of affordability. The third and final section then turns to the importance of storage, as food can be lost even after it has been produced and distributed. Ultimately, by considering these different points at which access can break down, the essay argues that widespread hunger persists because increased production does not by itself ensure that food both reaches those who need it and remains affordable when it arrives.
When considering the relationship between production and access, distribution is the most immediate constraint, since increased production is of little value if weak transport infrastructure prevents food from reaching remote communities. In South Sudan, for example, more than half the country's roads become impassable for over six months during the rainy season: overland movement gets so unreliable that the World Food Programme has to pre-position supplies in remote areas before the rains hit (World Food Programme, 2021). In this case, the challenge is largely logistical: food exists within the wider aid system while still being extremely difficult to move to where it is needed. Such barriers, however, need not arise from inadequate infrastructure itself. Ethiopia’s Tigray region in 2021 presents a related but distinct case, since conflict rather than weather disrupted access. Food trucks were unable to reach food-insecure communities in Ofla and Neqsege Woreda because humanitarian operations were concentrated largely in urban centres, leaving many rural communities without regular food assistance (United Nations Office for the Coordination of Humanitarian Affairs, 2021). What the comparison between these cases shows is that the same gap between supply and access can arise through very different mechanisms: where flooded or unusable roads isolate a community physically, conflict can render an otherwise usable route inaccessible. In either case, however, aggregate production tells us very little about whether food is actually available at the scale where hunger is experienced.
Both examples also concern failures of distribution. The same point, however, can be reinforced from the opposite direction by showing that where road access improves, the connection between production and local markets strengthens accordingly. In rural Ethiopia, this relationship is especially clear, since improved road access substantially strengthened the connection between production and local markets. Using data from 2012 to 2016, Nakamura et al. (2019) estimated that rural road development increased household consumption by 16.1 percent on average and by 27.9 percent in the most remote communities, while farmers connected by those roads sold a larger share of their harvests. Household consumption is a broad welfare measure, so the headline figures should not be treated as a simple estimate of how much additional food families ate. Their significance lies, rather, in the market connection they capture. Better roads altered the relationship between remote households and the markets through which agricultural goods were exchanged. Read alongside South Sudan and Tigray, this suggests that transport infrastructure mediates between the existence of food in one place and its availability in another, whether that connection is weakened or strengthened. Accordingly, agricultural technology can expand the quantity supplied, but that expansion only reaches the people it is meant to benefit if the routes linking farms, markets, and households are functioning.
Physical availability, however, resolves only part of the access problem, since food that reaches a market can nonetheless remain beyond the purchasing power of the households living beside it. The scale of this problem is evident in the 2026 State of Food Security and Nutrition in the World report, which estimated that the average global cost of a healthy diet had reached 4.28 PPP dollars per person per day in 2025 and that approximately 2.69 billion people, or 32.7 percent of the world’s population, could not afford one (Food and Agriculture Organization of the United Nations et al., 2026). At the same time, the gap between supply and affordability also leaves poorer households more exposed to price shocks, so that even a modest rise in prices can push people below the poverty line. On this point, Mahler et al. (2022), working from a specified set of assumptions, estimated that a 1 percent rise in global food prices could push nearly 10 million additional people into extreme poverty. That figure is better understood as an indication of sensitivity than as a precise forecast, but it nevertheless demonstrates how quickly greater nominal supply can cease to matter when household purchasing power falls. Affordability can therefore deteriorate even where the overall quantity of food available remains unchanged.
A concrete example of how this price pressure can compound other forms of insecurity can be seen in Somalia. In early 2025, approximately 3.4 million people were already facing crisis-level hunger or worse, with the World Food Programme projecting that the figure could rise to 4.4 million between April and June due to a combination of high food prices, drought and conflict; the situation was especially dire given that food production in 2024 had itself been 45 percent below the long-term average (World Food Programme, 2025). At the same time, high local and imported food prices were identified by a separate IPC assessment as a major constraint on household access (Integrated Food Security Phase Classification, 2025). Somalia should not be treated as a case in which price alone produced hunger, since conflict and drought were also both integral to the crisis. Its value as an example, however, is more fundamental. That is, it is illustrative because it demonstrates how price-related issues compounded those other pressures, with households confronting diminished supply and disrupted markets facing – through price – a further barrier to obtaining what remained of an already reduced supply of food. What this mechanism demonstrates, in microcosm, is that availability and affordability are not two descriptions of the same problem, so much as separate, often interlocking, constraints: production determines what can enter the food system, but it is household income and market prices that shape who can actually draw on that supply, and the two do not necessarily work in tandem. The implication is that while enhancing agricultural output can ease price pressures through supply-and-demand mechanics, that enhancement does not in itself guarantee that the increased volume of food will be accessible to those most vulnerable to hunger.
Beyond these geographic and economic barriers created by distribution and price, a further constraint comes in the form of storage. After all, food must remain usable long enough to be consumed. Although this problem is less obvious, the challenges it poses can be substantial. For instance, a 2022 report co-produced by the United Nations Environment Programme and the Food and Agriculture Organization estimated that ineffective refrigeration contributes to the loss of roughly 526 million tonnes of food production each year, which is equivalent to about 12 percent of the global total; they therefore suggested that developing countries could save 144 million tonnes annually if their cold-chain infrastructure operated on a level roughly equivalent to that of developed countries (United Nations Environment Programme & Food and Agriculture Organization of the United Nations, 2022). Understanding that part of an expanded harvest can disappear from the food system before consumers have any opportunity to benefit from it necessarily complicates any assumption that greater output automatically translates into greater usable supply.
For a practical illustration of this mechanism it is instructive to look at Rwanda, where a World Bank diagnostic found that because tomatoes lacked cold storage at both farm and market stages – which left them between 7 and 15 degrees Celsius above their ideal temperature – their usable life was reduced to roughly one to three days, compared with one to three weeks under more suitable conditions. Partly because of this, in 2017, the country’s tomato supply chain recorded an estimated loss rate of 49 percent (World Bank, 2020). (Given that the figure relates to the wider supply chain, it should not be interpreted solely in relation to inadequate cold storage provisioning, though it remained a major driving factor). The significance of storage is reinforced by the converse effect – in which enhanced storage capabilities reduce hunger – observed elsewhere in Africa. In Tanzania, improved storage translated directly into more stable household food security: in a randomized controlled trial, which saw smallholder households given low-cost hermetic storage bags, severe food insecurity during the lean season was reduced by 38 percent; a 20 percent reduction was likewise recorded across the full seasonal cycle (Brander et al., 2021). In a similar vein, according to research discussed by the International Food Policy Research Institute, hermetic bags have been found to reduce post-harvest losses by 90 percent among farmers in Bihar and also improve food security and net revenues (Laishram et al., 2020). In each of these cases, storage played a major role in determining whether a harvest remained available long enough to meet household needs.
An obvious objection to this account of constraints is that it risks understating the importance of production. That enhancing output is necessary, however, does not mean it is sufficient on its own, since additional output improves food security only to the extent that the surrounding system can convert it into access. When a territory has poor transport links, the food produced across larger harvests may nonetheless remain distant from the food-insecure communities by whom it is required, and, where household incomes are too low, though more food may reach markets it may do so without becoming significantly more affordable. When storage is inadequate, some proportion of the additional supply may spoil before it can be used. On this point specifically, it is worth pointing out that increasing output without improving preservation can partly reproduce the very losses that higher production is intended to overcome. Taken together, what these constraints suggest is that while improved agricultural technology can alleviate part of the problem on its own, the conditions that generate unequal access may remain substantially unchanged.
Ultimately, then, what these cases collectively demonstrate is that persistent hunger is less paradoxical than it may at first appear. Global productive capacity describes how much food can be generated. But this is not the only factor in the equation. Food security also depends on the circumstances through which that food becomes available to particular households. Transportation capacity is consequential because it determines whether supplies can reach communities, price is important because it conditions whether households can obtain them once they arrive, and storage matters as it impacts the usability of the food produced. Not only can failure across any of these aspects divorce increased production from consumption, but they can also reinforce one another since, for example, disrupted transport can raise local prices, and poor storage can reduce the quantity of food entering a market. As such, while investment in agricultural technology remains undeniably important, its benefits also depend on the wider systems that connect production to access and preserve food once it has been produced. For this reason, the persistence of widespread hunger in a world increasingly capable of producing enough food is best understood as a product of failures in the conversion of abundance into access. The problem of world hunger has not yet been solved, in other words, because, though enough food may exist, this does not mean that households can all reliably obtain or consume it.
References
Brander, M., Bernauer, T., & Huss, M. (2021). Improved on-farm storage reduces seasonal food insecurity of smallholder farmer households – Evidence from a randomized control trial in Tanzania. Food Policy, 98, Article 101891. https://doi.org/10.1016/j.foodpol.2020.101891
Food and Agriculture Organization of the United Nations, International Fund for Agricultural Development, United Nations Children's Fund, World Food Programme, & World Health Organization. (2026). The state of food security and nutrition in the world 2026: Understanding and addressing the high cost of a healthy diet. https://doi.org/10.4060/cd8306en
Integrated Food Security Phase Classification. (2025, September 23). Somalia: IPC acute food insecurity and malnutrition snapshot, July-December 2025. https://fsnau.org/downloads/Somalia_IPC_Acute_Food_Insecurity_Malnutrition_Jul2025_Dec2025_Snapshot.pdf
Klümper, W., & Qaim, M. (2014). A meta-analysis of the impacts of genetically modified crops. PLOS ONE, 9(11), e111629. https://doi.org/10.1371/journal.pone.0111629
Laishram, R., Schwartz, S., & Jones, M. (2020, February 21). India forum: Securing the harvest for food security. International Food Policy Research Institute. https://www.ifpri.org/blog/india-forum-securing-harvest-food-security/
Mahler, D. G., Yonzan, N., Hill, R., Lakner, C., Wu, H., & Yoshida, N. (2022, April 13). Pandemic, prices, and poverty. World Bank Blogs. https://blogs.worldbank.org/en/opendata/pandemic-prices-and-poverty
Nakamura, S., Bundervoet, T., & Nuru, M. (2019). Rural roads, poverty, and resilience: Evidence from Ethiopia (Policy Research Working Paper No. 8800). World Bank. https://doi.org/10.1596/1813-9450-8800
United Nations Environment Programme, & Food and Agriculture Organization of the United Nations. (2022). Sustainable food cold chains: Opportunities, challenges and the way forward. https://doi.org/10.4060/cc0923en
United Nations Office for the Coordination of Humanitarian Affairs. (2021, May 6). Ethiopia - Tigray region humanitarian update: Situation report, 6 May 2021. https://www.unocha.org/publications/report/ethiopia/ethiopia-tigray-region-humanitarian-update-situation-report-6-may-2021
World Bank. (2020). Rwanda food smart country diagnostic. https://documents1.worldbank.org/curated/en/288911601302842762/pdf/Rwanda-Food-Smart-Country-Diagnostic.pdf
World Food Programme. (2021, April 15). United States funding helps WFP reach millions of people in South Sudan. https://www.wfp.org/news/united-states-funding-helps-wfp-reach-millions-people-south-sudanWorld Food Programme. (2025, March 4). Somalia faces worsening hunger as drought, conflict and high food prices risk pushing 1 million more people into food insecurity. https://www.wfp.org/news/somalia-faces-worsening-hunger-drought-conflict-and-high-food-prices-risk-pushing-1-million