Shannon-Hartley Law

The Shannon-Hartley theorem defines the maximum rate at which information can be transmitted over a communication channel with a given bandwidth and noise level. The formula is elegant: channel capacity increases with bandwidth and signal strength, and decreases with noise. As a mental model, it applies wherever information flows — conversations, organisations, marketing, leadership. Every communication channel has a maximum throughput determined by its bandwidth (how much it can carry), signal strength (clarity of the message), and noise (competing information, distraction, ambiguity). To transmit more information reliably, you either increase bandwidth, boost signal, or reduce noise. Most people only try to talk louder. The model says: cut the noise first.

For every communication channel in your business — meetings, emails, dashboards, marketing — assess the signal-to-noise ratio. Cut noise before amplifying signal. Reduce the number of channels, simplify messages, eliminate unnecessary data, and create dedicated bandwidth for high-priority information. The constraint on communication is rarely the message — it's the noise around it.

The Shannon-Hartley Law sets the maximum information throughput for any channel based on bandwidth, signal strength, and noise. In business, it teaches that communication bottlenecks are usually noise problems, not signal problems. Cut noise before amplifying message.