From a fascinating Foreign Policy article on the global black market:
System D is a slang phrase pirated from French-speaking Africa and the Caribbean. The French have a word that they often use to describe particularly effective and motivated people. They call them débrouillards. To say a man is a débrouillard is to tell people how resourceful and ingenious he is. The former French colonies have sculpted this word to their own social and economic reality. They say that inventive, self-starting, entrepreneurial merchants who are doing business on their own, without registering or being regulated by the bureaucracy and, for the most part, without paying taxes, are part of “l’economie de la débrouillardise.” Or, sweetened for street use, “Systeme D.” This essentially translates as the ingenuity economy, the economy of improvisation and self-reliance, the do-it-yourself, or DIY, economy. A number of well-known chefs have also appropriated the term to describe the skill and sheer joy necessary to improvise a gourmet meal using only the mismatched ingredients that happen to be at hand in a kitchen.
I like the phrase. It has a carefree lilt and some friendly resonances. At the same time, it asserts an important truth: What happens in all the unregistered markets and roadside kiosks of the world is not simply haphazard. It is a product of intelligence, resilience, self-organization, and group solidarity, and it follows a number of well-worn though unwritten rules. It is, in that sense, a system.