What is one of the types of CPI export related to commodities?

The movement of a commodity across the U.S. border is a key aspect of Commodity Price Index (CPI) exports. This process involves transferring goods out of the U.S. to international markets, where they can be sold or further processed. Such exports play a significant role in the economy by influencing supply and demand on a global scale and affecting prices domestically. This option aligns with the fundamental concept of exportation, which is crucial for understanding how commodities are traded internationally and the implications they have for economic metrics, including CPI.

In contrast, the other options focus on activities that do not involve exporting commodities beyond national borders. For instance, transferring a commodity within the U.S. pertains to domestic movement rather than international trade. Public sales and internal storage are also internal processes and do not represent the export of goods, as they do not involve the crossing of borders. Thus, understanding the importance of cross-border movement distinguishes it as a vital component of CPI export activities related to commodities.