Take for example the Chinese beef being labeled as premium New Zealand beef and sold for much higher prices in supermarkets. If shoppers can't tell the difference without this analysis, then it implies that the price differential between these two products is larger than it should be.
That specific Chinese beef producer is likely selling his product to a wholesaler at a standard (low) price. It is somewhere else in the supply chain that the mislabeling comes in - and that is the entity that makes the profit. If that beef producer was aware that his beef is selling at a much higher retail price, then he should be selling his product to the wholesaler at a much higher price. What prevents this from happening? Well, knowledge (and a marketing budget). There should be plenty of capital available to solve that problem :)