Once upon a time, circa 1970, there was no such thing as “hi-fi.” It was just audio. And every household had a system, likely built around a solid-state stereo receiver or amplifier. Names like ...

Julia Kagan is a financial/consumer journalist and former senior editor, personal finance, of Investopedia. Khadija Khartit is a strategy, investment, and funding expert, and an educator of fintech ...