Final answer:
An example of a source of sales data is the monthly survey of retail sales conducted by the Census Bureau. Another source is the sales data collected by companies involved in international flows of capital.
Step-by-step explanation:
An example of a source of sales data is the monthly survey of retail sales conducted by the Census Bureau. This survey collects data on sales from businesses throughout the United States on a monthly basis. The government adjusts these figures with foreign trade data to account for exports and imports.
Another example is the sales data collected by companies involved in international flows of capital, such as banks and companies making financial investments. These companies are required to file reports, which are compiled by the U.S. Department of the Treasury.
These sources provide the main basis for figuring out what is produced for consumers and contribute to the U.S. balance of trade statistics.