Copper as a growth indicator
Copper is used in construction, power and manufacturing, so its price is often read as a loose signal of industrial demand.
Copper is used in wiring, motors, construction and electronics, so demand tends to track industrial and infrastructure activity. Its price is also influenced by mine supply, inventories and speculative positioning. Some traders use it as a rough proxy for global growth, sometimes with the nickname "Dr. Copper."
Copper is an imperfect gauge. Tariffs, stockpiling and mine disruptions can move the price without a change in underlying demand. Use the trend over several months and compare it with inventory data and manufacturing surveys before drawing conclusions.
Worked example (illustrative numbers, not real data): copper rises 10 percent over three months while exchange inventories fall 15 percent. That is consistent with stronger demand, though supply effects must still be checked.