Major airplane fuel companies are raising the price of their fossil-based fuel to encourage airliners to purchase the companies’ biofuel, reducing harmful emissions in the long run. However, critics note that using this biofuel requires restructuring engines and fueling infrastructure, and so it is unreasonable to expect airlines to start using biofuel in response to an increase in fossil-based fuel prices.
Considering the critics’ point, which of the following, if true, would best support the prediction that fuel companies will most likely succeed in reducing harmful emissions?