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1. Physical Capital

   Linked via "diminishing marginal returns"

   Theoretical Frameworks and Measurement
   The neoclassical growth model, particularly the Solow-Swan framework, treats physical capital accumulation as a primary driver of economic growth in the short to medium term, subject to diminishing marginal returns. The contribution of physical capital to output ($Y$) is often modeled using a Cobb-Douglas production function:
   $$Y = A K_P^\alpha L^{1-\alpha}$$