On Thursday, e-commerce giant Amazon.com (NASDAQ: AMZN) surprisingly announced it plans to add 100,000 new, full-time, full-benefit jobs in the U.S. during the next 18 months. While one big storyline out of this could be how the move puts the company in alignment with President-elect Donald Trump’s outspoken priority to create jobs in the U.S., there’s another narrative the announcement highlights — one that investors will appreciate: The big hiring spree reflects the aggressive growth the company believes it still has ahead of it.