The best replacement for classical economics is keynesian economics.

The best alternatives to classical economics are rated as following:
★★★★★  keynesian economics
★★★★  keynesian
★★  neoclassical economics
★★  neoclassical
★  austrian
  modern economics
  mercantilism
  supply side

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Speaking about classical economics, one probably shouldn't forget about adam smith.

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★★★★★ adam smith
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