Increases in world oil prices since 2004 have challenged consumers and oil-importing countries across the world. Oil prices temporarily fell sharply in 2009, only to triple three years later. The oil import share of gross domestic product rose by nearly half among net oil importers in just two...

We present a five-year revision of an empirical study started in 2007. Seven years ago, we found two three distinct periods characterized by sustainable linear trends in the difference between the headline consumer price index (CPI) and the core CPI in the USA. Then we revealed similar behavior...

In April 2009, we introduced a model representing the evolution of motor fuel price (a subcategory of the consumer price index of transportation) relative to the overall CPI as a linear function of time. Under our framework, all price deviations from the linear trend are transient and the price...