What is American Customer Satisfaction Index?

Legal Definition
The American Customer Satisfaction Index (ACSI) is an economic indicator that measures the satisfaction of consumers across the U.S. economy. It is produced by the American Customer Satisfaction Index (ACSI LLC), a private company based in Ann Arbor, Michigan.

The ACSI interviews about 80,000 Americans annually and asks about their satisfaction with the goods and services they have consumed. Potential respondents are screened to guarantee inclusion of customers of a wide range of business-to-consumer products and services, including durable goods, services, non-durable goods, local government services, federal government services, and so forth. Results from data collection and analyses are released to the public throughout each calendar year. ACSI data has been used by academic researchers, corporations, government agencies, market analysts and investors, industry trade associations, and consumers.
-- Wikipedia
Legal Definition
A new way to evaluate satisfaction in american households. The goods and services are financial, insuance, durables manufactured, nondurable manufactured, public administration, government, retail, services, communications, transportation, and utilites.