Which economic indicator can directly influence a marketing strategy focused on high-end products?

Disposable income is the correct choice because it directly reflects the amount of money consumers have available to spend on non-essential items, which is critical for high-end products. When consumers have a higher disposable income, they are more likely to spend on luxury goods and premium services. This economic indicator is particularly relevant for businesses that cater to affluent markets or offer products with higher price points, as it indicates the population's ability to make purchases in that segment.

Understanding disposable income allows marketers to tailor their strategies effectively, such as setting appropriate pricing, identifying target demographics, and planning promotional campaigns that resonate with consumers who can afford luxury goods. Marketing strategies may vary significantly in periods of increasing or declining disposable income, so recognizing its changes can enhance a company's ability to adapt and thrive in a competitive marketplace.