This is a new one: Amazon being challenged by price competition. Up until now, consumer flock to the e-commerce giant for cheaper prices and reliable service. There seems to be a trend reversal now. Further improvements to the distribution network by Walmart, erosion of price differential due to tax collection on purchases, price matching games being played out by competing online retailers are fresh challenges to be overcome.

Read more of this at: A Problem for Jeff Bezos: The Mall is Becoming Cheaper Than Amazon on the The Wall Street Journal Blog