On Friday, the United States Copper Index Fund (CPER) rose 0.3% and the iPath Series B Bloomberg Copper Subindex Total Return ETN (JJC) was 0.7% higher. Over the past week, JJC declined 8.9% and CPER decreased by 8.6%. Prices for the industrial metal strengthened Friday alongside a broader rally in risk assets after data revealed the lowest reading in the year on long-term inflation expectations, Bloomberg reported.