What is $100 disappearing deductible?

What is $100 disappearing deductible?

Nationwide Vanishing Deductible Program Thirty days after you sign up, Nationwide gives you your first $100 deductible credit. For every year of accident-free driving after the first year, your deductible will drop by another $100. The program can be used to decrease your deductible for up to $500.

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