Also, petrol prices have generally risen in the past few years, and while this is doubtless mostly because of increasing demand, the suspicion exists that cartels are at least partly responsible.
另外，汽油价格在过去几年中普遍上涨，大部分原因无疑是需求的增长，但人们也怀疑卡特尔在其中至少起了部分作用。