People over the age of 50 in the UK are investing their money in non-traditional assets, it has been reported.
Research from Direct Line has found that £2.5 billion has been spent over the past five years on things like comic books, royal memorabilia and toys.
The firm added that out-of-circulation money was the most common alternative item collected by the age group (50 per cent), while antique glass or ceramics were popular with 22 per cent.
Andrew Lowe, home spokesperson for the firm, commented that investing in such products provided an alternative nest egg for the future.
"We are witnessing an increasing trend towards putting money into alternative investments such as collectibles and antiques," he said.
Two of the world's most valuable comic books both feature Superman.
Superman issue one from 1939 would fetch a lot, although the first issue of Action Comics, the man of steel's first appearance, is considered the comic collector's holy grail.
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