What is a 'Negative Interest Rate Policy (NIRP)'
A negative interest rate policy (NIRP) is an unconventional monetary policy tool whereby nominal target interest rates are set with a negative value, below the theoretical lower bound of zero percent.
BREAKING DOWN 'Negative Interest Rate Policy (NIRP)'
During deflationary periods, people and businesses hoard money instead of spending and investing. The result is a collapse in aggregate demand which leads to prices falling even farther, a slowdown or halt in real production and output, and an increase in unemployment. A loose or expansionary monetary policy is usually employed to deal with such economic stagnation. However, if deflationary forces are strong enough, simply cutting the central bank's interest rate to zero may not be sufficient to stimulate borrowing and lending. (See also: How Interest Rates Can Go Negative.)
Read more: Negative Interest Rate Policy (NIRP) Definition | Investopedia http://www.investopedia.com/terms/n/negative-interest-rate-policy-nirp.asp