For the purpose of encouraging and promoting the marketing of agricultural commodities of the United States and assisting American farmers, processors, distributors, and exporters to adjust their operations and practices to meet world conditions, the Secretary of Agriculture shall acquire information regarding the competition and demand for United States agricultural commodities, the marketing and distribution of such commodities in foreign countries and shall be responsible for the interpretation and dissemination of such information in the United States and shall make investigations abroad regarding the factors affecting and influencing the export of United States agricultural commodities, and shall conduct abroad any other activities including the demonstration of standards of quality for American agricultural commodities for which the Department of Agriculture now has or in the future may have such standards, as he deems necessary. Nothing contained herein shall be construed as prohibiting the Department of Agriculture from conducting abroad any activity for which authority now exists.