Islamic finance's phenomenal growth owes to the Shariah compliant nature of its financial instruments. Shariah forbids the charging of interest (Riba) and instead promulgates risk-sharing and trade-based modes of financing. The Islamic financial industry has been subject to both critique and admiration. Critics argue that Islamic instruments (bearing debt-based structures) differ from their conventional counterparts only in legal lexicon and not in economic impact.

Economics should schematically explain the key elements and main strands of this core part of social life: the actual workings of our economies. This book argues that orthodox, modern neoclassical economics does not fulfil this core task. Standard economics models do not address the real functioning of our market economies, but rather an imagined economy.

Though apparently siblings from the same family, New Keynesianism and Post-Keynesianism are completely different schools of economic thought. As to why and in what regard exactly, that is what this book is all about. While the former is the official label of the current mainstream in economic research and teaching (rather than neoclassic economics, which would be more apt a term), the latter tries to preserve the original thinking of John Maynard Keynes, but also additional ideas and concepts of all those building on his work.