At first glance, it seems that Tesla Motors (NASDAQ:TSLA) and (NASDAQ:AMZN) have little, if anything, in common. However, from an investment perspective, the luxury electric-car maker and the world's largest online retailer couldn't be more alike. Let me explain.

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Tesla investors and Amazon investors have a lot in common these days. As Tesla's ballooning valuation attests, the company's shareholders are willing to sacrifice near-term profits for future profitability -- much like stakeholders of Amazon's stock. In fact, Amazon has employed a similar strategy for years now. The e-commerce giant continues to burn through cash in order to invest in new growth initiatives such as Amazon Web Services or its business-to-business venture AmazonSupply.

Revolutionizing their respective industries
Since founding the company in 1995, Jeff Bezos has proven he isn't afraid to forgo quarter-to-quarter profit for long-term gains.An as example, Amazon doesn't currently make money on its Prime service. However, it does entice customers to spend more (and more frequently) by offering free two-day shipping on an unlimited number of deliveries for just $79 a year. 

While Amazon is considering increasing the price of Prime by $20 to $40 more per year, the service was never meant to be a revenue generator for the company. Instead, Amazon introduced Prime as a way to attract new customers to the website while creating value for existing customers. This strategy has so far paid off for the online retailer, as Amazon now counts tens of millions of paying subscribers to its Prime membership.

For Amazon, the lack of shipping options was one of the early setbacks for online shopping. With its Prime offering, Amazon laid the groundwork for speedier and more affordable delivery. As the Amazon of autos, Tesla is achieving a similar feat today in the niche electric-car market with its Supercharging network. Until now, one of the major setbacks for widespread electric-vehicle adoption was the lack of charging infrastructure. However, Tesla is changing that reality one Supercharger station at a time.

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Source: Tesla Motors.

The California-based automaker is investing loads of cash into the buildout of a worldwide charger network that lets Tesla drivers make long-distance road trips without ever needing to stop at a gas station. Tesla recently connected its East Coast and West Coast Superchargers. This means that Model S drivers can now drive across the U.S. using only Superchargers. Similar to the way in which Amazon Prime helps convert more shoppers into Amazon shoppers, Tesla's Supercharging network aims to convert more drivers into Tesla drivers through the value-added service.

Momentum stocks built for growth
On the surface, both of these stocks look wildly overpriced. Amazon trades close to $359 a share, with a price-to-earnings multiple north of 600. However, that's not to say that Amazon isn't pulling in sufficient cash. Indeed, it generated net sales of $25.59 billion in its fourth quarter of fiscal 2013. The kicker is, Amazon reinvests much of its quarterly earnings back into the company.

Tesla is following a similar trajectory today, as the EV maker pushes into overseas markets, ramps up production, and continues to open new Supercharger stations and retail showrooms in the U.S. and abroad. It trades at about $252 a share today, which is more than 68 times next year's projected earnings. For comparison, Ford trades at just seven times forward earnings today at roughly $15 per share.

The difference is that investors in both Tesla and Amazon are willing to pay up now for future profitability, even if their respective stocks take years to grow into their current valuation. Nevertheless, at today's levels, both of these stocks are priced for perfection. But don't worry if you missed out on the Tesla and Amazon rallies. The Motley Fool has an even better way to unlock superior growth.

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Tamara Rutter owns shares of and Tesla Motors. The Motley Fool recommends and owns shares of and Tesla Motors. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.

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