Historically, this has lead to devaluation in currency and a relative rise in the value of gold, as it's one of the only "currencies" they can't just print.

Tom Walker is a blogger and designer who works for an ecommerce store (offering HP supplies) as the lead editor and writer on their blog about vintage advertising and print media design.

The study, with UC Davis postdoctoral scholar Tonya Jacobs as lead author, was published online in the journal Psychoneuroendocrinology and will soon appear in print.