Is there ONE thing that if cost was lower would trigger total decline in cost of living?

I thought about this as I replied to Mama's reply on eating out. Is it fuel?? Wages?? Rent??? If any ONE of those major expenses were lowered would it cause a trickle down effect? I know fuel is key BUT the cost of that waivers so much. I just wish there was some sorta way to get things right again. Tough to do when there is so much dishonest gouging.