The first day of Amazon's Prime Day event and competing retail sales that kicked off on Tuesday drove solid online spending compared to a year earlier, according to two data sources.Adobe Digital Insights,

Amazon’s Prime Day event has grown to four days, but some signs point to a lack of consumer enthusiasm this year.

Amazon.com's Prime Day sales were lower on the first day said Momentum Commerce. The company which manages online sales for 50 brands said its Amazon sales plunged 41% on Tuesday when compared with the start of Prime Day last year.