Currently, Africa in general and Katanga in particular are facing a deterioration in the physical and social environment. This was attributed to the degradation of multifaceted all-out industrialization, the population explosion (with its pressure on land) and the multiple crises that plunge into extreme poverty. In Katanga potato to a net increase in importance and whose ecological requirements fit well with the environment. So in general, this work is to analyze the economic and financial profitability of the potato by sector approach in Lubumbashi mining hinterland, and in the specific outline it is to assess the socio demographic variability potato consumer, generate profitability and profit marketing (calibration) in the interim relative to the flow market, estimating the cost of production, labor productivity, soil and the producer price of the city of Lubumbashi. For the realization of this work, investigations were conducted on a random sample of 85 players in the sector. To achieve this, documentary techniques have contributed to the literary synthesis for the preparation of this work and the analysis of variance and Tukey's test was used to compare means of different parameters observed, thanks to the Mini software tab 16.It appears to say that the big producers break monopoly over small, the production cost is low. The intermediate second level to realize substantial profits, although profitability is comparatively negligible compared to the first level intermediaries who establish direct contacts with producers. Moreover, earnings fluctuated depending on the markets, so that some markets are benefited to the absence of obstacles increase the cost, if the toll taxes and customs. Variability share attributed to the potato market holds calibration varies independently of markets. According to this study, potato large caliber is the most profitable, as for consumers, the variability of households is perceived in terms of age, level of education; size and annual consumption frequency.

The rate of unemployment in Lubumbashi remains high and for those which are likely to work, their monthly wages do not meet all the daily needs for their households. The survival of the majority of households is ensured more or less 75 % by the informal economy where especially the women are active. Night marketing in downtown area is one of the strategies of survival and constitutes a source of income making it possible to cover some domestic loads. This article aims to identify the economic activities of the households and to determine the contribution of each one of them in the domestic budget, to quantify certain current monthly expenditure of the households by identifying those which are financed by the night marketing of the agricultural produce. To reach that point, 62 salesmen were surveyed the night in the downtown of Lubumbashi in the interval of 17 h 30