The New York metropolitan area has the most intensive concentration of home offices in the nation, with 17 percent of its households operating a business from home. (The New York Times)
After having read the Merriam-Webster dictionary, I cannot find a definition of "intensive" that explains how this word is used in the sentence above.
Is it proper English to use this adjective (intensive) in that context? As a learner, I thought that "high" is more proper, but, as usual, I'm unsure.