As COVID-19 has led to more desktop usage overall it could be said that the screen size has increased for the general consumer. Previous research shows that what device a consumer uses when browsing the internet also affects their behaviour and more particularly their decision making. Previous research regarding consumer behaviour also shows that consumers when exposed to different amounts of alternatives act differently when making a decision. Connected to devices and their obvious distinction when it comes to screen size and therefore the amount of alternatives displayed to the consumer on the screen makes it interesting.  Most of the previous research regarding alternatives and consumer behaviour had not been done in a digital context and this thesis was aimed at studying how consumers react to different amounts of alternatives in a digital context. The authors got interesting contradictory results from the two different AB-tested experimental questions indicating a more complex explanation to the causality of the research into alternatives and consumer behaviour. The author's main conclusion is that consumers' attitudes and then preferences towards products influenced by their internal search could have an explanation to why some products are more advantageous to be displayed as large assortments than others.

La microfinance, dont l’un des objectifs est de combattre la pauvreté, consiste en la fourniture de produits financiers à tous ceux qui sont exclus du système bancaire classique. Elle est née dans les années 1970, s’est diffusée dans les pays du Sud et s’est révélée être, en quelques décennies, un vecteur de développement. Cette thèse met en évidence ses limites et ses dérives, sans nier certains de ses succès. Au Tchad, dans certains cas, elle a produit des effets pervers et a conduit à l’endettement. L’étude menée répond à un travail de terrain pluridisciplinaire, conjuguant des approches financières et socio-culturelles. Les données recueillies proviennent de nos méthodes et techniques mises en place au cours de diverses enquêtes menées à N’Djaména et à Moundou entre janvier 2009 et mars 2012. Notre recherche a montré, entre autres, comment et à quel niveau se situe l’intervention de la microfinance auprès des populations défavorisées. Dans cette optique, nous avons analysé les obstacles rencontrés et précisé les conditions requises pour que ce type d’outil puisse être efficace, le secteur informel ainsi que l’économie sociale et solidaire étant susceptibles – en tant qu’outils de lutte contre l’exclusion – de rétablir le lien social / Microfinance, which one of the objectives is combating poverty, is the provision of financial products to all people who are excluded from the traditional. It emerged in the 1970s, spread in the countries of the South and proved to be, in a few decades, an instrument of development. This dissertation highlights his limits and his drawbacks, without denying some of its success. In Chad, in some cases, it has produced perverse effects and led to debt. This study is a pluridisciplinary field work, which aligns financial and socio-cultural approaches. Our research has shown, among others, how and at what level is situated the intervention of microfinance to the poor. In that process, we analyzed the obstacles and specified the conditions required so that this type of tool could be effective, the informal sector and social solidarity and economy etc. restore the social ties as they are effective for combating exclusion