Information Rules: A Strategic Guide to the Network Economy

Shapiro and Varian's book is the cleanest account of the economics that governs information goods — zero marginal cost, network effects, lock-in, switching costs, versioning, standards wars. Written in 1998, before the dominance of SaaS and platforms, and yet almost every mechanism shaping today's tech landscape is described here in its original formulation. For product direction this is required reading on pricing, packaging and competitive positioning: most strategy conversations at tech companies are applied Shapiro and Varian without anyone noticing. The examples are dated, the frameworks are not. Treat it as the foundational text it is.