Explainer: How does negative interest rates policy work?

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ISHARES 20+ YEAR TREASURY BOND ETF (NASDAQ: TLT) Delayed: 80.13 +0.67 (0.84%)
Previous Close $79.46    52 Week High $143.62 
Open $80.07    52 Week Low $118.66 
Day High $80.37    P/E N/A 
Day Low $79.84    EPS $0.00 
Volume 28,288,635