According to Dr Daniel Ayuk Mbi Egbe, a professor at the University of Linz in Austria and an expert on African solar resources, this is not good news.
The Greek shadow economy, which is made up of unreported income, was 25.1% of gross domestic product in 2007, according to Friedrich Schneider, a professor at Johannes Kepler University in Linz, Austria.
He started his career at LASK Linz in 2003 where he scored three goals in 35 appearances and won Austria's young player of the year award a year later.