Economists and energy industry executives disagree about the extent to which measures such as a windfall-profits tax or moves to curb speculation will rein in rising oil prices. 对于暴利税或抑制投机的举措能在多大程度上控制高涨的油价，经济学家和能源行业人士意见不一。
However, speculation that the South African government is considering imposing a windfall tax on resource companies saw share prices fall sharply at the end of the month. 然而对南非政府可能考虑对资源企业征收暴利税的猜测又使股价在月末大幅回落。
