Notions of Liquidity Trap

On Fazit, Gerald Braunberger reviews the concept of “liquidity trap.”

  • Keynes never used the term but Robertson did.
  • Hicks introduced the common notion (represented, e.g., by a flat LM curve).
  • Krugman talks about a different trap. So does Blanchard and he (incorrectly) attributes it to Keynes. So does Sinn.