Zero Lower Bound, ZLB
Updated 2026-08-09
INTRODUCTION
English translation pending.
CORE DEFINITION
The zero lower bound refers to the limit on cutting nominal interest rates, since holders of cash can always earn zero by holding currency, so significantly negative rates would drive deposits into cash. When the policy rate reaches this bound and the economy still needs stimulus, conventional monetary policy is exhausted and the situation becomes a liquidity trap. Policy must then turn to unconventional tools such as asset purchases, forward guidance or fiscal expansion.
SCAFFOLDING EFFECT
Reduce cognitive load
- Check the floor: ask whether your strongest lever has already been pushed to its limit. - Switch instruments: move to unconventional tools when the standard one stops working. - Avoid exhausting one tool: keep an unused lever rather than spending your best option first.
Anchor fast decisions
Because cash yields zero by default, a negative policy rate would push savers into currency, so the rate cannot go far below zero. Once the rate is at that bound, further monetary easing through the interest channel is impossible, and any remaining stimulus has to work through asset purchases, expectations or fiscal channels. The tool is not ineffective by nature; it has simply reached its limit.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Zero_lower_boundverified
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