Zagat Surveys are best-selling guides based on democratic principles. The Los Angeles Marketplace Survey covers over 1,830 purveyors of baked goods, candy, caviar, cheese, coffee and tea, cookware, ethnic sources, fish, flowers, food specialty items, health food, herbs and spices, ice cream and yogurt, meat and poultry, prepared foods, produce and wine plus top caterers, restaurant delivery services and cooking schools in the Los Angeles area. The information is gathered utilizing extensive questionnaires reflecting the opinions of thousands of people. The Los Angeles Food and Entertaining Marketplace is based on a survey from 2,200 participants.