The 2021 growth, expected to be partly driven by product price hikes, would be the smallest rise since Adobe started tracking holiday spending data in 2014.
With companies raising product prices due to skyrocketing commodity and transportation expenses, consumers are expected to pay 9 per cent more between Thanksgiving and Cyber Monday this year, Adobe said.
It said out-of-stock messages on retailers' websites were up 172 per cent at the end of July from pre-pandemic levels, with apparel stocks depleting the fastest, followed by sporting goods, baby products and electronics.
To cope with the potential inventory shortfalls, retailers are offering fewer discounts and looking to spread out the selling season by encouraging shoppers to start their holiday shopping early this year.