Final answer:
Marketers must monitor their competitors' products, prices, distribution, and promotional efforts because new product offerings by a competitor may require adjustments to the firm's marketing mix.
Step-by-step explanation:
Marketers must constantly monitor their competitors' products, prices, distribution, and promotional efforts because the actions of competitors may require adjustments to one or more components of the firm's marketing mix. For example, if a competitor introduces a new product offering, the firm may need to adjust its own product offerings, pricing strategy, distribution channels, or promotional campaigns to remain competitive in the market.