Marginal cost curves universally exhibit a U-shape due to diminishing marginal returns
the verdict
OVERSTATED
true in a weaker form than the claim states
confidence 0/100
Although traditional economic theory posits a universal U-shaped cost curve driven by diminishing returns, empirical and theoretical investigations reveal that cost and return relationships frequently follow more complex trajectories, such as S-curves or linear patterns depending on scale and context.
what the evidence does support
Marginal cost curves often exhibit a U-shape in traditional economic theory and certain contexts, though empirical studies show they can also follow S-curves or linear patterns.
Evidence for · 2
A cost function for HIV prevention services: is there a 'u' – shape?
2007 · cited by 66
Paper 0 finds empirical evidence of U-shaped average cost curves in HIV prevention programs as scale increases.
Evidence against · 2
Formalizing the HRM and firm performance link: the S-curve hypothesis
2020 · cited by 12
Paper 2 demonstrates that the relationship between investment and performance is nonlinear in the shape of an S-curve rather than a simple U-shape.
See more details
More for · 1
The increasing returns to scale <scp>CES</scp> production function and the law of diminishing marginal returns
2015 · cited by 11
Paper 3 examines production functions and notes that while diminishing returns typically apply, certain conditions can violate standard assumptions.
More against · 1
The nonlinear relationship between urban design form and energy efficiency.
2026 · cited by 0
Paper 10 finds that urban form and energy efficiency follow a distinct S-shaped trajectory with varying marginal returns rather than a universal U-shape.