Unit Economics
A company can grow revenue explosively, raise huge rounds, and dominate headlines — and still be doomed, if it loses money on every customer. Unit economics is the question underneath all the aggregate financials: does a single customer, on its own, make money? Get that right and scale is the amplifier of a good thing; get it wrong and scale just multiplies the losses. It's the most important economic idea for judging whether a business actually works — and the one flashy growth numbers most often hide.
A company can grow revenue explosively, raise huge rounds, and dominate headlines — and still be doomed, if it loses money on every customer. Unit economics is the question underneath all the aggregate financials: does a single customer, on its own, make money? It's the most important test of whether a business actually works.