Final answer:
The grand strategy that refers to increasing sales of existing products in existing markets through marketing efforts is known as market penetration, which is an intensive growth strategy.
Step-by-step explanation:
The market penetration strategy involves marketing efforts to increase sales of existing products in existing markets. This is a type of intensive growth strategy that focuses on increasing the market share for current products or services in current markets through a combination of marketing techniques. These can include advertising campaigns, price changes, improved customer service, or product bundling. In contrast, a four-firm concentration ratio is used to assess the level of competition within a market by measuring the percentage of total industry sales accounted for by the top four firms. High ratios indicate a concentrated market with limited competition. Whereas, exclusive dealing refers to arrangements where a reseller agrees to sell only the products of a single supplier.