Empirical evidence suggests that top players often play together in one team. Based on the O-ring theory (Kremer 1993) a Zidane clustering theorem is derived. It is argued that the best midfielder is most efficiently allocated when combined with an ace striker, and vice versa. This implies that...

[Introduction] Ten years ago, the global economic and financial crisis was at its peak. When ailing investment bank Lehman Brothers filed for insolvency on 15 September 2008, the smouldering crisis on the financial markets became a full-scale firestorm. While falling real estate prices had...

[Introduction] The world is currently experiencing an economic boom. All of the major economic areas - the USA, Europe, Japan and China - are seeing strong economic growth. But beyond current favourable conditions there are signs that the world is currently undergoing a fundamental transition...