The shopping site said on Thursday it would same-day delivery service to
"We know same-day delivery volumes will grow dramatically now that we are making it free," he said.
Amazon launched Prime a decade ago offering free, two-day shipping - at first charging $79, then raising the service to $99 last year. In 2009 Prime launched same-day delivery and last year started a one-hour delivery service, Prime Now.
Prime has become the cornerstone of Amazon's growth - and a testing ground for new services ranging from television programs and movies to delivery-by-drone.
Earlier this year Amazon said U.S. Prime membership increased 50 percent in 2014. In December, it said customers ordered more than 10 times as many items via same-day delivery this holiday season, compared to a year earlier. The same-day delivery service is already available in cities such as New York, Philadelphia, the San Francisco Bay area, Seattle, Atlanta,
(Image: Reuters)