The book "Information or Market Power: What is Governing Dealers' Pricing Behaviour in FX Markets?" by Markus Alexander Schmidt offers a comprehensive analysis of the pricing mechanisms in the foreign exchange market, particularly regarding the role of information asymmetries and market power. By applying a microstructural approach, it investigates how these factors influence the dynamics of exchange rates. The study is based on a unique dataset of EUR/USD transactions from a German bank and sheds light on how dealers shape their pricing strategies. The findings reveal that dealer pricing does not align with the expectations of traditional pricing theory, but is rather influenced by the relative market power of the dealers. This academic book is aimed at readers seeking a deeper understanding of the mechanisms behind price formation in foreign exchange trading.