lower bound

noun Mathematics.
an element less than or equal to all the elements in a given set: The numbers 0 and 1 are lower bounds of the set consisting of 1, 2, and 3.
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Example sentences
So the odds of running up against the zero lower bound are high, and recovery
  can be a long time in coming.
Both credit markets and labour markets struggle to clear because of the problem
  of low inflation at the zero lower bound.
Monetary policy has been operating near the zero lower bound to provide maximum
  monetary stimulus.
But, he pointed out, interest rates are constrained by the zero lower bound.
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