Andrew Waber, the director of market research at Momentum, told Forbes he still feels confident in the 14% growth prediction, noting the dip might be explained by Amazon offering four days of sales instead of the usual two this year, leading to less rush in the early hours. Topline A report from a major sales manager Tuesday found early Amazon Prime Day sales were down nearly 14%— but this might just mean customers are spending less in the early hours after Amazon doubled the length of its landmark sales ev ...