Total domestic Yellow Pages industry advertising revenue reached a record $13.6 billion in 2001, up from $13.2 billion in 2000, according to figures announced by the Yellow Pages Research Institute
(YPRI), the research unit of the Yellow Pages Publishers Association (YPPA). This represents growth of approximately 2.8 percent over the previous year. The data is based on the aggregate results
provided to the Institute by Yellow Pages publishers in the United States. It includes local and national spending in the more than 6,000 Yellow Pages directories published domestically.