Concerns have been raised over savings accounts with people in the UK unable to recollect how they spent £83 billion last year.
Britons spend more than £1,700 on purchases they cannot remember, suggests a report from Visa UK.
This results in the average UK adult making £33 of mystery purchases a week, with women spending £29 and men paying out £36.
Analysts suggest this extra money could be put into savings accounts instead, or to pay utility bills.
Greg Twitcher, vice president of Visa UK, commented: "This research reveals how difficult it is to keep track of your spending when using cash."
Consumers suggest mystery spending is more likely to happen when out food shopping and when on trips with children and grandchildren.
The news comes as research suggests that more Britons are spending as opposed to saving.
Around two-thirds of Britons suggested they would use any additional income gained on a holiday abroad as opposed to a savings account.




