Todd Spangler NY Digital EditorAmazon’s two-day 2021 Prime Day event yielded about $6.8 billion in revenue, although nearly half of that came from third-party merchants, according to Morgan Stanley estimates.Amazon, as is its usual custom, is not disclosing dollar sales figures for Prime Day, which ran over a 48-hour period June 21-22.The ecommerce giant said Prime Day 2021 was the biggest two-day period ever for Amazon’s third-party sellers, “growing even more than Amazon’s retail business.”