Amazon says it has recorded sales of around 64 items every second on so-called 'Cyber Monday', one of the busiest days for online shopping.The first two Mondays of December tend to be the busiest as people begin shopping on the internet for gifts. John Lewis reported the best week of trading in its 150-year history and had reported it had sold an average of one tablet computer every second and a flatscreen 40-inch TV every minute throughout Black Friday.The British economy has become increasingly dependent on consumer spending, which accounts for two-thirds of economic activity.