High prices can be the result of speculation, and maybe plunging prices can be attributed to the end of speculation, but low prices over time aren't caused by speculation. That's oversupply, mainly by Saudi Arabia flooding the market with low-priced oil to discourage rival oil producers, whether it's Russian oil or American fracking.
I don't think that governments should permit speculation in raw materials, because they're what the economy basically needs.
The effect of metals speculation was to push up the prices that China had to pay to countries like Australia. This squeezed China. Once the speculative demand ended, all of a sudden the added production facilities that had been brought into production by the high prices went out of production again, and there was a glut.
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