This report presents an analysis that defines and quantifies the extent of government intervention in the agricultural sectors of the market-oriented countries most active in trade. One aim is to provide usable economic information for the multilateral trade negotiations (MTN), recently launched under the auspices of the General Agreement on Tariffs and Trade (GATT). Results are designed to measure the levels of support (or taxation) provided to both agricultural producers and consumers using the concept of producer and consumer subsidy equivalents (PSEs and CSEs). Overviews are presented of the agricultural policies and perspectives on the new MTN of the United States and other GATT members, particularly the countries of the European Community, Canada, Japan, Australia, and New Zealand. Charts and narrative descriptions of the calculated PSEs and CSEs are provided for grains, oilseeds, cotton, livestock, dairy products, and sugar in 17 countries. PSEs and CSEs are then compared. These findings are reported: less developed countries tend to assist consumers; developed nations tend to assist producers; and assistance to producers of food grains, dairy products, and sugar tends to be higher than assistance to other producers. (YLB)