Rule of 300

Rule of 300

In marketing, a general rule stating that one should send out enough direct mail to receive at least 300 responses. The rule of 300 involves establishing an expected response rate. For example, if the expected response rate is 10%, the marketer should send 3,000 pieces of mail. The rule of 300 ensures a fairly representative response. In this sense, the rule of 300 is rather like polling.
References in periodicals archive ?
* Michigan exhibited the most setback conflicts of the six states assessed, but it also has the most stringent setback rule of 300 feet between wells and occupied structures of any of the states.
Philippine President Rodrigo Duterte's message to the nation was also shared where he urged his fellowmen to be inspired by its heroes who fought against Spanish colonial rule of 300 years In the Philippines.