I was reading about a woman in the US who began to panic at the fact that she had zilch savings even though she was in her 30s. She was earning rather well and had no dependents. She had only one credit card which she used extensively, but always ensured that she cleared it at the end of every billing cycle. By doing so, she avoided debt on the card. Clearly, a lot was in her favour—her circumstances and her behaviour. So why were her savings non-existent?