Carollo, Salvatore - 2012 - 2nd ed (Online-Ausg.)
"Oil prices have seen massive fluctuation over the past 10 years, with price per barrel growing from $9 to $140. More recently, we have seen fluctuation from $140 to $37/barrel, and back up to $120 - all in a matter of months. But why? It is still a popular belief that OPEC can affect the price...