EMH 0.00% 16.5¢ european metals holdings limited

Great read about EMH, page-46

  1. 435 Posts.
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    C1 - lithium carbonate production cost
    C3 - total production cost

    So far clear.

    But I still do not get why they present there co-product and by-product costs. And I already asked here once or twice. So maybe third time will get lucky. What is meant by co-product and by-product?
 
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