Copper consumption is associated with economic growth, in particular growth in constructions. And if the demand is high, then it is logical to assume that the prices will rise. And that logic allows us to use the copper prices as an economic indicator.

Another metal that is associated with construction is steel. There are many types of steel and also many prices of steel, just like oil baskets. But we can look at two types that are definitely used for construction. And we can use them as an "economic indicators".