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US shoppers' shift in behaviour

25 February 2014 Last updated at 10:31 GMT

US retailers are experiencing very uneven fortunes but not all of it can be explained by the health of the economy.

A shift in consumer habits is also playing a part, with analysts saying that shops must combine their various "channels" - their online and physical offerings.

Michelle Fleury reports from New York and visits an online optician that decided to open a physical showroom.