Overall economic conditions change – during the global recession, there were fewer new houses build, so demand for copper fell.
New technologies arise – flat-panel screens use indium, an element that had little use before, so demand for indium goes up.
Old technologies decline – the US switched from leaded gsasoline to other anti-knock products, so lead was not used in that way any more.
Occasionally, and eventually, supply limitations force or will force changes in demand (or use). You can’t use what isn’t there.
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