Yellow Brick Road vs The Rest of Oz

The labs are aggressively pursuing the obvious horizontal layer of agentic AI — general code generation, writing, image creation, and simple tool-calling agents. This is the well-trodden Yellow Brick Road, where raw model capability dominates and labs hold decisive advantages in scale, distribution, and architecture.

The real moats and durable value creation lie in The Rest of Oz: complex, vertical, multi-step workflows involving messy real-world data, legacy systems, regulatory constraints, multi-player coordination, and industry-specific tribal knowledge. These require deep scaffolding, data flywheels, governance, and deterministic outcomes that horizontal models cannot easily replicate.

This Ledger Entry expands how readers think about agentic AI opportunities by showing that while foundation models commoditize the obvious horizontal layer, the deepest economic moats exist in the harder, domain-specific vertical applications that are difficult to replicate.