If a firm has positive results from market testing, the next step will be the: Product launch.
Market testing is a marketing strategy and can be defined as the way in which companies give out their product so as to receive feedback about the product or to know customer opinion about the product before producing the product in large quantity.
Based on the given scenario the next step if the company receive a positive feedback will be to launch the product.
Therefore the next step will be the: Product launch.
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