Explain how the urban explosion contributes to the growth of the informal economy in developing countries

1.Explain how the urban explosion contributes to the growth of the informal economy in developing countries. 2.What is the role of the informal economy in cities of the developing world. Does it still play an important role in cities of the developed world, such as the US? Your response must be at least 2 pages in length, excluding the reference section. Be sure to use APA format, including in-text citations and a reference section. No wiki sources are accepted. References from textbook, journal articles, or other reputable are acceptable.