Chapter 1 notes a change in the composition of private intergenerational transfers in France, from more intrahousehold transfers in the 1980s to more inheritance. Using an overlapping generations model, we show that a rise in wealth inequality can influence the composition of these transfer. The share of intrahousehold transfers in human capital accumulation and the extent of the preference to bequeath can influence this inequality. Chapter 2 looks at the role of the demographic boom on the prevalence of informal employment, with the context of Egypt. We introduce overlapping generations of heterogeneous education levels in a multi-sectoral model. After calibrating and simulating the model, we show that a temporary demographic boom of better educated workers can have long-run effects on non-formality rates, interacting with output and prices. Chapter 3 examines the heterogeneity of micro and small enterprises (MSEs) in Morocco. These enterprises are grouped into three categories: top performers, potential gazelles and ``others.'' Top performers tend to do relatively well in all areas examined. Potential gazelles, on the other hand, appear to choose their sectors of economic activity differently and appear to face particular constraints in access to credit and the ability to link to other businesses. Informal firms are less heterogeneous, showing only a small upper echelon that can compete with formal firms.