The best replacement for marginal cost is marginal benefit.

The best alternatives to marginal cost are rated as following:
★★★★★  marginal benefit
★★★★  average cost
★★★★  marginal revenue
★★★  variable cost
★★★  total cost
★★  average total cost
★★  marginal product
★★  average variable cost
★  opportunity cost
★  incremental cost
★  sunk cost
  fixed cost
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Speaking about marginal cost, one probably shouldn't forget about average cost.

Other search terms related to marginal cost and their ratings are:
★★★★★ average cost
★★★ marginal revenue
★★ profit function and cost function
★★ total cost
★ marginal benefits
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