The number of people who made purchases in the UK in November showed a "significant" drop from last year, retail researchers say.
The Springboard analysis company reported a 3.2% drop in the traffic of people in shopping centers, business parks and High Streets.
The figures showed that the effect of Black Friday was driving more online purchases over a longer period, the company said.
The decline was "indisputable evidence" that Black Friday had no benefits for physical stores, he added.
The launch pad said that it is expected to decline 4.2% year-on-year in December, a larger decline compared to the 3.5% decrease recorded in December 2017.
"Since 2013, when Black Friday has established itself as a key trading day, the number of casualties has declined every year and the only increase in 2017 was just 0.2%," said Diane Wehrle, Marketing director and in-depth analysis of Springboard.
"This year, in all other retail challenges, the -3.2% drop in November was the biggest in November since Springboard started to publish footfall data in 2009, and in the week of Black Friday, the decline has fallen by -5.5%, more than in every week of the month. "
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The growth of online shopping has been one of the main challenges for the United Kingdom's High Streets, which have seen the collapse of a number of chain stores over the course of the year, due to the worsening of trading conditions.
Springboard said that the UK political turmoil on Brexit also impacted buyers' buying decisions.
"As we head towards the top of the retail trade calendar, both retailers and consumers are in the midst of the greatest degree of uncertainty in recent times," said Mrs Wehrle.
"However, the fact that the parliamentary vote does not take place until mid-December could bring a slight glimmer of hope for some large-scale retailers, as consumers could buy now rather than later, in an attempt to overcome inflationary pressures. that are expected if the Brexit agreement is not ratified ".