Food production, mainly cereals such as sorghum, millet and maize in Africa, and rice in Asia, is generally the main source of income for the rural population. However, it must be got to market cheaply and at sold at a fair price, if the family is to meet its taxes, pay school fees, buy the food they cannot grow themselves and in general, meet the many emergencies that the poor have to face.
An adequate transport network from farm to market is crucial to efficient marketing structures. Products must get from the field to the household or village. Once consolidated into a viable load, a family member can bring it to one of the numerous small local markets, usually situated close to or often on a motorable road and hopefully at walking or cycling distance on good tracks and paths. Traders visit these markets or pick-up points and progressively build up a load sufficient to ensure a profit at a more distant market town. In some cases, if roads and weather permit, they will pick up at the farm itself. Alternatively, the farmer might choose to bypass the trader and either walk, cycle, or use whatever public transport there is to get to that market where he feels he will get the best price and at the same buy cheaply what he needs.
Taken from Design and Appraisal of Rural Transport Infrastructure, J. Lebo and D. Schelling, World Bank Technical Paper no 496
Underpinning all this transport activity is the natural desire of all parties to buy cheap and sell dear. Generally, prices increase as the number (and incomes) of buyers increases. Distance from the producer and the adequacy of the transport system are of course important factors. Lowest at the farm, they rise progressively at each market level, to meet the needs of consumers with diminishing time and space to grow their own. The prices of manufactured goods follow an inverse trend, thus providing a double advantage to the farmer who can bypass the trader and get to the town cheaply and rapidly, sell his produce and buy what he needs at lower prices. This requires some form of public transport as his load, if the journey is to be worth while, risks being too big to carry. Nevertheless, on market days, roads are crowded with people who may have carried or wheeled their 40kg loads fifteen km or more, as transport is too expensive or scarce.
At the same time transport costs increase more and more rapidly as we travel backwards on the table above from town to village. Roads worsen, especially in the rainy season. Truck operating costs increase as do overheads as loads become smaller and the risk of being held up for hours or days due to breakdown or closed roads increases. In some cases, marketing costs may become so high due to poor roads that imported food may become cheaper in the major urban areas, with disastrous consequences for rural towns and villages, not the least being flight to the cities.
It important to remember that markets are not just about buying and
selling. Getting to market also means getting access to gossip, advice,
useful information and of course the various products and services
often only available in towns. Roads reduce isolation and the poverty
associated with it.
Rural roads can never be better than just good enough. Networks are far too extensive, making up well over 90% of the total as can be seen above, when we include the simple tracks and paths that with the low-volume motorable roads make up the rural road network. However, the crucial role they play in the food marketing system requires that they be given more attention than at present. This means not only more investment, but also more attention to the points raised on this site so that it will not be wasted, as often happened in the past when rural roads were improved at vast expense, but without any improvement in mobility. The costs imposed by poor transport add a significant margin to the prices of basic foods and, by reducing its supply, further drives them up.

