Marble suppliers can be divided into three categories: mining (self extraction), trading (agent sales), and processing (tailored made). Mining type firms have a cost advantage due to lower prices but are constrained by vein reserves. Trading type firms consolidate resources from multiple brands to offer one-stop purchasing; while processing type firms serve the luxury market, like LOGO engraving on marble for high-end stores. In selection criteria, check for supply chain consistency (out of stock rate < 5%) and level of QC (first class product rate ≥ 95%).
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