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An exponential function can have negative y-values.

However, a real-world exponential decay model will never have negative values. Think of it this way... If you divide a positive number by 2 (or take half of it) and then divide that next number by 2, you will never reach or go below 0.

For Example:

20, 10, 5, 2.5, 1.25, 0.625, 0.3125, etc.

(Each number is half of the number before it.)

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Q: Can an exponential decay model have negative y values?
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Related questions

Is the equation P500(1.03) with an exponent of n a model of Growth or Exponential Decay?

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