Chicago - Wal-Mart is sharpening its attack on Amazon.com.

The world’s largest retailer is trimming its free-shipping pilot program to two days from three, and it’s cutting a dollar off the membership price. Membership is now $49 per year.

The Bentonville, Arkansas, company began testing the new service last year in answer to Amazon Prime’s two-day shipping, a big part of its domination of the retail sector.

Amazon membership costs $99 a year, which comes with a bewildering array of perks, including household product subscriptions, one- and two-hour Prime Now delivery, streaming music and video, photo storage and more.... Read More: VIN