The first day of Amazon AMZN, +1.25% Prime Day generated $6 billion in sales, up 7.8% from last year, making it the biggest U.S. online shopping day of 2022 so far, according to the Adobe ADBE, -1.10% Digital Economy Index. "Consumers took advantage of discounts that were offered, after having experienced many months of heightened prices online," said Pat Brown, Adobe vice president, in a statement.