Mekanisme Liquidity Trap dan Kegagalan Kebijakan Moneter Konvensional Setelah Krisis Global
Keywords:
liquidity trap, zero lower bound, quantitative easing, monetary policy, financial crisis, deflation, unconventional policyAbstract
The 2008 global financial crisis pushed major advanced economies into a liquidity trap where conventional monetary policy lost effectiveness. This conceptual paper examines the post crisis liquidity trap with characteristics distinct from the Japanese episode of the 1990s. Banking sector damage, extreme uncertainty, and global simultaneity amplified the trap beyond previous theoretical formulations. Five mechanisms explain policy ineffectiveness: broken interest rate channel due to the zero lower bound, impaired credit channel from bank capital losses, deflationary expectations becoming self fulfilling, destroyed financial intermediation, and international policy coordination failure. Central banks adopted unconventional tools including quantitative easing, forward guidance, and negative interest rates. Fiscal policy regained importance with larger multipliers under zero interest rate conditions. Comparison between the United States and Europe reveals that policy speed and aggressiveness determine recovery duration. The zero lower bound poses a fundamental constraint requiring rethinking of monetary policy frameworks including higher inflation targets. Long term scarring effects from prolonged liquidity trap include human capital erosion and permanent output loss. The paper concludes with theoretical implications for incorporating Knightian uncertainty and financial sector frictions into macroeconomic models, alongside practical recommendations for central banks regarding commitment credibility and international coordination.
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