This is a book about economics and racism: During World War I, the liberal global economic system, based on principles of free trade and most-favored nation treatment and negotiated in gold parities, collapsed for good. The disintegration and collapse of commerce eventually led to racist cleansing, expulsion and mass murder. Against this background, this book offers new perspectives on the racist fault-lines that appeared and deepened in European economies after the end of what was regarded as the Great War. At what point did people start to ostracize their neighbors economically because they thought they were of a different ethnic group? Who decided who was to be excluded? Where did the fault-lines open? Where did the boundaries lie? How were they defined - by law, or by common practice? How much extra time and money were people prepared to spend in order to do ostracize their neighbors? And what did that mean for the economy - and society - as such?