Back in early 1800s Europe, only aristocrats and rich merchants typically had access to banks. Artisans, farmers and domestic servants stashed money away under the pillow, if they saved at all.
Then, over the following few decades, a savings revolution took place. Fearful of poverty and social insurrection, governments used state finances to back savings banks, offering ordinary people a safe way to sock money away and earn interest.
Around 200 years later, the transformation that began in Europe remains incomplete. Some 2.5 billion adults didn’t have a bank account in 2011, from a global population of around 7 billion, according to the World Bank’s most recent estimates. Some 60% of adults in developing countries didn’t have accounts, compared with only 11% in high-income economies, according to the bank.