43% of shoppers say there are too many sales to keep track of, while 39% say one major sale event is enough to get what they need Analysts say the growing volume of promotions is eroding their effectiveness, with sales units either matching or falling below prior-year levels Despite signs of fatigue, experts don’t expect retailers to cut back on promotional events anytime soon Several of the retail industry’s biggest sales events, such as Amazon Prime Day, Target Circle Deal Days, Walmart...