The iPath® US Treasury 10-year Bear ETN is designed to provide investors with inverse exposure to the Barclays 10Y US Treasury Futures Targeted Exposure Index™.
The Barclays 10Y US Treasury Futures Targeted Exposure Index™ (the "Index") is designed to decrease in response to an increase in the 10-year Treasury note yields and to increase in response to a decrease in 10-year Treasury note yields. The Index targets a fixed level of sensitivity to changes in the yield of the current "cheapest-to-deliver" note underlying the relevant 10-year Treasury futures contract at a given point in time.
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 http://www.globalfunddata.com/funds/new/performance/strategy?variant=Trading-Inverse Debt
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