noun. A substance, such as a petroleum distillate, that is used as a catalyst, as in spreading an intentionally set fire.

That accelerates; accelerating.

noun. That which quickens; specifically, one of the nerves stimulation of which causes increased rapidity of the heart's action.

noun. Any substance that can bond, mix, or disturb another substance and cause an increase in the speed of a natural or artificial chemical process.

noun. A substance that accelerates the development of a fire; especially some petroleum product used to spread an act of arson

noun. A substance used to catalyze the vulcanization of rubber

"This would just remove an effective "accelerant" to further economic decline."

catalyst  

amino-acid  biological-agent  chemical-agent  condensible  engine-driven