Mercedes chief Toto Wolff believes the manner in which the top teams in Formula One are spending money is not a viable long-term strategy.
Speaking to Autosport ahead of discussions about a possible cost cap in 2015, Wolff admitted that the excessive spending at the front end of the grid is a threat to the future of the sport.
"Probably the highest spending teams spend three or four times the money of those other teams. Is that sustainable and healthy? No," the Mercedes chief told Autosport.
"Efficiency is what is being asked from our mother company, but the gaps, if you take the highest spending team compared to the midfield teams like Force India, Williams and Sauber, are...
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