Even though farming accounts for only about 1 percent of the total national workforce, it is at the core of the food and fiber system. The system is one of the largest sectors in the U.S. economy, and is comprised of industries related to farming, including feed, seed, fertilizer, machinery, food processing, manufacturing, and exporting. The interrelationships among the sectors of the food and fiber system and the U.S. and world economies are many and complex. As a result, U.S. and world policies and economic factors, such as interest and inflation rates, play a critical role in everything from the cost and availability of farm credit to the demand for farm products at home and abroad. The farm crisis of the 1980s illustrates how specific economic events can impact the food and fiber system. In addition, long term changes in the system have occurred in response to shifts in consumer incomes, demographics, lifestyles, and perceptions of health and diet.