Final answer:
Walmart collects external marketing data on prices, rents, customer age, and voting preferences to forecast its sales and adjust its strategies.
Step-by-step explanation:
Walmart collects external marketing data to forecast its sales. They look at information such as prices and rents, as well as data on customer age and their reaction to debates. For example, Walmart sends data collectors to visit or call stores to collect price data on specific products, and they also conduct surveys of landlords or tenants to collect rent information.
Additionally, they gather information about customer age and their voting preferences through phone surveys and questionnaires. By analyzing this external marketing data, Walmart can make more informed sales forecasts and adjust their strategies accordingly.