Parallel economies to reduce inequalities: The middle class is hurting. Wages are stagnating, while the rich are getting richer. The main culprit is the current low-growth, which prevents job mobility and wage renegotiation. Enough complacency! Could parallel economies speed up the activity? The benefits of such parallel economies – often overlooked by economists – are explained through historical examples. ... and contain global warming: If parallel economies can help, then the last chapter's Green-Market System could work. To be successful, such a System must create jobs with good wages, and convincingly cut down CO2 emissions. Would this System be too good to be true?