Interest

Interest is the price of using borrowed money, and the people who end up paying attention to it are borrowers, savers, and anyone comparing accounts or loans. By our assessment, its strength is that it is the central signal in finance: one rate can change what credit costs, what savings earns, and how quickly debt grows. The downside is that the word covers several different things in practice, so the context always matters, and careless reading can lead to a bad comparison. In use it is less a product than a moving term that sits on bank offers, cards, deposits, and loans, which is why people keep checking the small print. Against similar financial labels, it is basic but unavoidable.