Explainer: How does negative interest rates policy work?

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ISHARES 20+ YEAR TREASURY BOND ETF (NASDAQ: TLT) Delayed: 83.66 -0.23 (0.27%)
Previous Close $83.89    52 Week High $143.62 
Open $83.74    52 Week Low $118.66 
Day High $83.77    P/E N/A 
Day Low $83.43    EPS $0.00 
Volume 14,285,099