German Development Minister Svenja Schulze has called for greater international taxation of the super-rich along with counterparts in Spain, Brazil and South Africa. “There are currently around 3,000 billionaires worldwide. A tax could be set up as a minimum levy of 2% on the assets of the super-rich,” Schulze wrote in an opinion piece on Thursday. Spanish Economy Minister Carlos Cuerpo, Spanish Finance Minister María Jesús Montero, South African Finance Minister Enoch Godongwana and Brazilian Economy Minister Fernando Haddad also put their names to the article, which appeared in Germany’s Der…