The fuel efficiency of jet engines has increased over the past year. The demand for jet fuel has increased over the past year. The cost of refining petroleum for jet fuel has increased over the past year. The number of jet airline flights has decreased over the past year.
The increase in the price of jet fuel is due to a sharp decrease over the past year in the supply of jet fuel available relative to demand. Nonetheless, the amount of jet fuel available for sale is larger today than it was last year.
If the statements above are true, which one of the following conclusions can be properly drawn on the basis of them?