For two decades, e-commerce has grown more than 20 percent, fueled by the explosion of providers like Amazon. But this year was a turning point.

Black Friday results have reinforced that this U.S. holiday shopping season will be one of the best in recent memory. But even in good times, there are concerns for retailers.

The turkey is browning, your guests are on route, and you suddenly remember a forgotten ingredient. Amazon stands ready to bail you out.

For Walmart, Macy’s and many other U.S. retailers, sales growth is back. But it’s coming at a heavy cost.

Researchers and trade groups expect retail sales in stores and online to grow 5 percent or more — which could make this Christmas shopping season the best in recent memory.