Index funds keep pushing copper prices ever since it rose above $5,000 a ton.

The funds are likely to keep buying metals like copper, as overall macroeconomic indicators are still positive.

She rose above the occasion.

At these prices, the door is open for a permanent substitution of copper.

Supply isn't going up as much as demand so the prices of metal, especially that of copper and zinc, are going up.

Those subtle differences (in returns of index funds) make a big difference over the long term.