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The relation by which plant cost scales with capacity raised to a power near 0.6 is the _____ rule.

  • A.Lang
  • B.linear
  • C.six-tenths
  • D.square root

Answer: C

Correct answer: six-tenths

The six-tenths rule: \(C_2 = C_1 (Q_2/Q_1)^{0.6}\). The exponent below unity is the economy of scale, and it is the reason large plants have lower capital cost per tonne of capacity than small ones.

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