Some new facts from Amazon's (AMZN) holiday season should only strike more fear in the hearts of rival bricks-and-mortar retailers. 

Because collectively, they point to one thing: a future of increasing dominance for Amazon amid the shift to on-demand shopping. Here are several facts Amazon released on Tuesday from its holiday season:

Amazon Devices See Sales Blowout

Amazon said it saw a record holiday shopping season for its voice-enabled devices, with "millions more" gadgets purchased globally compared to last year's holiday season. The Echo Spot, Echo Dot and Echo Buttons continue to be sold out, Amazon noted. 

In effect, more Amazon voice-enabled devices sold this holiday season means more people that are intertwined in the Amazon ecosystem in 2018. That could mean fewer trips, or online orders, from other retailers in 2018. 

Amazon Prime Continues to Grow

Amazon devices aren't the only thing that will keep people engaged in the Amazon ecosystem in 2018. How about all the new members to Prime as we enter 2018. Amazon said Prime membership "continued to grow" this holiday season. In one week alone, Amazon said, more than four million people started Prime free trials or began paid memberships.

Respect the Amazon App

Despite many big box retailers such as Walmart (WMT) and Best Buy (BBY) offering price match guarantees to prevent "showrooming", the Amazon app was still a hot destination for shoppers. Amazon said customers shopping on its app surged nearly 70% worldwide this holiday season. The result is yet another sign that consumers still believe Amazon has the cheapest prices and the best selection.  

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