From page 9 of P.T. Bauer’s From Subsistence to Exchange and Other Essays:
In Nigeria, for example, individual groundnut farmers may sell a few pounds of groundnuts at a time and operate 500 to 700 miles from the ports whence the groundnuts are shipped in consignments of thousands of tons. Imported consumer goods arrive in large consignments and are often bought in minute quantities. In Nigeria, matches arrive in consignments of several hundred cases, each case containing hundreds or thousands of boxes. The ultimate consumer may buy only part of a box. The sale of one box is at times a wholesale transaction; the buyer resells the contents in little bundles of ten matches, together with part of the striking surface of a box. Cheap imported scent arrives in large consignments: the ultimate consumer often does not buy even a small bottle but only two or three drops at a time, perhaps a dab on each shoulder of the garment. In some African countries smokers buy single cigarettes, or even a single inhaled drag of a cigarette.
To a Western audience it may seem as if sales of produce and purchases of consumer goods in such small quantities must be wasteful. This is not so. If consumers could not buy in these small quantities, they would either have to tie up their very limited capital in larger purchases or, more likely, would not be able to consume the products at all. The same considerations apply to a farmer’s sales of produce to an intermediary.
It is evident that in these conditions the task of collecting and bulking produce and of breaking bulk and physical distribution of merchandise involves much labor. What may be somewhat surprising is that a large part of this labor is self-employed. This is so because entry into small-scale trading is easy. In the absence of officially imposed obstacles such as restrictive licensing or official monopsonies, there are few if any institutional barriers, few administrative skills are needed, and little initial capital is required. The supply price of self-employed labor is low in the absence of more profitable opportunities. For these reasons small-scale operations are economic in many parts of the distribution system: large firms are at a disadvantage because their operations require more administrative and supervisory personnel, and these tend to be relatively expensive or ineffective in many poor countries. A multiplicity of small-scale traders in part represents the substitution of cheaper labor for more expensive labor.