The informal economy, which includes unregistered firms and firms that avoid taxes and regulations, plays a significant role in many developing countries. This paper examines the role of informal firms in economic development and presents evidence that challenges three prevailing views: the romantic view, the parasite view, and the dual view. The romantic view suggests that informal firms could become the engine of economic growth if not stopped by government regulation. The parasite view argues that informal firms unfairly compete with formal firms by avoiding taxes and regulations, undermining economic progress. The dual view suggests that informal firms are highly inefficient and do not contribute to economic growth, which is driven by efficient formal firms. Using data from World Bank firm-level surveys, the paper finds that informal firms are small and extremely unproductive compared to formal firms. Formal firms are run by better-educated managers, use more capital, have different customers, and access more external finance. The evidence supports the dual view, suggesting that informal firms do not contribute to economic growth and are not a threat to formal firms. The paper also finds that informal firms are not a significant competitive threat to formal firms, as they operate in different markets and have different customers. The informal economy is measured using various indicators, including tax evasion, self-employment, and electricity consumption. The size of the informal economy is strongly negatively correlated with income per capita, indicating that it is larger in poor countries. The paper also finds that the informal economy is influenced by the cost of becoming and staying formal, as well as the benefits of being formal. The results suggest that the informal economy is a manifestation of underdevelopment and that its decline is due to the conversion of informal firms to the official status or their death and replacement by formal firms. The paper concludes that the informal economy is not a significant source of economic growth and that the hope for economic development lies in the creation of large, registered firms run by educated managers and utilizing modern practices. The findings challenge the romantic and parasite views and support the dual view, which emphasizes the inefficiency of informal firms and the importance of formal firms in driving economic growth.The informal economy, which includes unregistered firms and firms that avoid taxes and regulations, plays a significant role in many developing countries. This paper examines the role of informal firms in economic development and presents evidence that challenges three prevailing views: the romantic view, the parasite view, and the dual view. The romantic view suggests that informal firms could become the engine of economic growth if not stopped by government regulation. The parasite view argues that informal firms unfairly compete with formal firms by avoiding taxes and regulations, undermining economic progress. The dual view suggests that informal firms are highly inefficient and do not contribute to economic growth, which is driven by efficient formal firms. Using data from World Bank firm-level surveys, the paper finds that informal firms are small and extremely unproductive compared to formal firms. Formal firms are run by better-educated managers, use more capital, have different customers, and access more external finance. The evidence supports the dual view, suggesting that informal firms do not contribute to economic growth and are not a threat to formal firms. The paper also finds that informal firms are not a significant competitive threat to formal firms, as they operate in different markets and have different customers. The informal economy is measured using various indicators, including tax evasion, self-employment, and electricity consumption. The size of the informal economy is strongly negatively correlated with income per capita, indicating that it is larger in poor countries. The paper also finds that the informal economy is influenced by the cost of becoming and staying formal, as well as the benefits of being formal. The results suggest that the informal economy is a manifestation of underdevelopment and that its decline is due to the conversion of informal firms to the official status or their death and replacement by formal firms. The paper concludes that the informal economy is not a significant source of economic growth and that the hope for economic development lies in the creation of large, registered firms run by educated managers and utilizing modern practices. The findings challenge the romantic and parasite views and support the dual view, which emphasizes the inefficiency of informal firms and the importance of formal firms in driving economic growth.