Mylan manufactured demand by lobbying for laws requiring EpiPens in schools, running "disease awareness" ads to heighten fear, and creating a free school training program specifically for their device. This created economic "lock-in," making it difficult for cheaper alternatives to compete and securing a captive market.

GE employs a razor-and-blades model on an industrial scale, accepting losses on initial engine sales to powerful airframers like Boeing. This secures a multi-decade, high-margin stream of mandated service and parts revenue from a fragmented base of airline customers, where aftermarket sales can be 3-5 times the original engine price.

AI can easily clone a product's user interface. However, a mature product's real defensibility lies in its "dark matter"—the vast, invisible knowledge of countless edge cases, regulatory nuances, and failure modes accumulated over years. This makes true replacement much harder than it appears.

Amphenol's components are a tiny fraction of a customer's total cost but are critical to system performance. The real value proposition is not the part itself but the confidence that the larger system won't fail. This dynamic creates high switching costs and pricing power.

Industrial gases are essential for manufacturing, making failure catastrophic for customers. However, they only represent 1-2% of a customer's total costs. This combination of high failure cost and low relative spend creates an extremely sticky customer base with very low price sensitivity.

GE serves two distinct customers: powerful airframers for the initial sale and a fragmented base of hundreds of airlines for aftermarket services. This split forces new entrants to solve a '3D puzzle' of satisfying both technically demanding OEMs and a global user base simultaneously, creating an immense and durable barrier to entry.

Unlike the broader aircraft parts market, the engine aftermarket is highly resistant to third-party 'PMA' parts. Even credible players like Pratt & Whitney have failed to copy GE parts. Technical complexity, voided warranties, and leasing company policies create a strong defense that protects lucrative service revenues.

An airline can lose $15,000 to $50,000 in revenue per day from a single grounded aircraft. This makes paying a high price for a TransDigm replacement part that ensures quick return to service an economically rational decision, despite eye-watering margins for the supplier.

The defensibility of complex hard tech companies doesn't rely on a single patent or technology. Instead, their moat is "novel in the aggregate"—the difficult-to-replicate integration of dozens of complex systems across design, manufacturing, supply chain, and regulation. This holistic execution is the true barrier to entry.