The two key characteristics of the growth stage of the product life cycle are:
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Increasing competition - As the product gains acceptance in the market, more competitors will enter the market, trying to capture a share of the growing demand.
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Rapid increase in sales - During the growth stage, the product typically experiences a significant increase in sales as more consumers become aware of and begin purchasing the product.
The other options, such as declining profits, marketers stimulating primary demand, and a decrease in repeat buyers, are not characteristic of the growth stage.