(FOX BUSINESS) -- A personal-finance trend called F.I.R.E. is gaining ground amongst millennials.
F.I.R.E. stands for "Financial Independence Retire Early.” Some millennials reportedly use it as a tool to help them retire as early as 30.
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F.I.R.E. followers try to invest as much as 75 percent of their annual income while cutting down on day-to-day expenses. But is it a solid retirement strategy?