The constitution of Guinea-Bissau makes little provision for workers and that which exists is not necessarily heeded. Forced labor is prohibited, and the economy is run along centralized lines, although this is changing under IMF and World Bank pressure. However, most of the population is employed in subsistence farming and the formal employment sector is small. There is no formal minimum wage. Children often work to help the household, leading to poor school attendance figures. Unions in the formal sector have been active, as was shown in strikes following the poorly handled entry into UEMOA in 1997.