Those commodities don't stand on their own. Mining copper for example uses fuel such as oil and gas products. As oil and nat gas dropped the cost to produce dropped to. So it's far more complicated than it seems.
Same goes for AG products.
Here are 3 ETF's (exchange traded funds) which track the price movements of the underlying precious metal. Gold, Silver, and Copper over last 4 years.
http://glenburniemd.net/CNET/Copper-Gold-Silver.png
Here's a chart for crude oil over last 5 years.
http://www.glenburniemd.net/CNET/5yrOilPrices2015.png
Here's a combined fund based on soybean, corn, wheat and sugar. Also going down. Note the high selloff recently of this fund's shares.
http://glenburniemd.net/CNET/AgriculturalFund-TAGS.png
Energy, Agriculture, Metals, all commodities, all going down a lot, all indicators of a Deflationary Cycle started. Here's a good site to check out more Commodities.
what about Transportation, how much goods is being moved?
It was doing well, up till this year, and since then it's been dropping. Here's an ETF which tracks the dow jones transportation average.
To put it mildly, things are not looking so good right now. Stock volume on Dow is about 40% of what it was 5 years ago. Volume indicator is at bottom of chart. The huge surge in stock prices was fueled by low to no interest rates from the Federal Reserve.
https://finance.yahoo.com/echarts?s=^DJI+Interactive#{%22range%22:%2210y%22,%22allowChartStacking%22:true}

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