The best replacement for paul krugman is niall ferguson.

The best alternatives to paul krugman are rated as following:
★★★★★  niall ferguson
★★★★★  ron paul
★★★★★  peter schiff
★★★★★  milton friedman
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★★  nate silver
★★  joe scarborough
★★  robert murphy
★★  joseph stiglitz
★  john cochrane
★  steve keen
  pedro schwartz
  raghuram rajan
  reality peter schiff

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Speaking about paul krugman, one probably shouldn't forget about charlie rose.

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