Escrito por Steve Daniels, um estudante da Brown University interessado no tema da Tecnologia Apropriada, o livro "Making Do - Innovation in Kenya's Informal Economy" pode ser visto na internet e apresenta uma investigação acerca dos "jua kali":
«The “jua kali” concept is ambiguous because the phrase was coined in the sixties to refer to people who work at manual jobs or with their hands under the hot sun. Today it means anyone in the informal sector whether a trader, producer or retailer and typically these businesses are between one or five people strong. The informal economy in Kenya comprises close to three quarters of all employment and creates about 90% of all new jobs annually according to Daniels. “The large manufacturers and formal sector in Kenya creates almost no new jobs and employs a small portion of the economy.”»
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