Christmas is traditionally a time of giving, including to charities and the needy. But what happens when so few of us carry cash anymore?
Using less cash means leaving more digital traces of where your money goes - but there are ways to keep some privacy.
Coins have always conveyed a message and, helpfully for historians, they are anchored to a specific time and space. Rome's emperors used coins to push their political agendas.
As cashless societies become a reality, we're starting to see this technological revolution has a dark side.