Which grand strategy focuses on the profitable growth of a single product in a single market?

The grand strategy that focuses on the profitable growth of a single product in a single market is indeed concentrated growth. This strategy emphasizes investing in and expanding one specific product within a particular market, leveraging the company's existing capabilities and market presence to maximize profitability and market share.

Concentrated growth allows a company to deepen its understanding of the market dynamics and customer preferences for that specific product, enabling it to refine its offerings and marketing strategies effectively. This focused approach can lead to enhanced competitive advantages, as the company can concentrate its resources and efforts into solidifying its position in the market.

In contrast, the other strategies, such as market development, product development, and horizontal integration, involve broader scopes. Market development targets new markets for existing products, product development seeks to introduce new products in existing markets, and horizontal integration involves acquiring or merging with competitors to increase market power. These strategies do not center on the growth of a single product in a single market, distinguishing concentrated growth as the most appropriate choice for the question presented.