The mathematical notion of exponential growth refers to a precise type of growth that happens to be (eventually) very rapid. But the phrase is often applied to any fast-growing phenomenon. A headline says this: "Paypal's mobile payments growing exponentially, reached $4B in 2011 ." Do you think this headline is really describing exponential growth, or is it just using a figure of speech? Explain your answer using the definition of exponential growth outlined in this section.
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