The famous scientist and historian of science Price puts forward that if K represents the number of people involved in a certain professional field, then the square root of this number is roughly equal to the number of top-ranked people who have contributed half of the field.
According to the above definition, the statement 'A country's publishing association has counted the country's journals and found that there are about 150 economic-related journals, of all economic-related scientific research papers, half of them are published in 13 journals' is in line with Price's point of view.