At a manufacturer level the economy will effect all series equally.
Rather than huge F1 teams with 800 personal, manufacturer's could support F1 with an engine program, compete at Le Mans, and in the WRC for a similar total budget.
Sportscars has maintained a privateer scene, manufacturer withdrawal's can be sustained, F1 doesn't appear to have such a back-up plan. Button and co. may have once turned their noses up at an Le Mans or IRL drive, that may have to change, ever increasing budgets and salaries appear a thing of the past.
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