This paper,by expanding the Dixit-Stiklitz monopolistic competition model,based on the panel data(2008—2018)of 9 cities in the Guangdong-Hong Kong-Macao Greater Bay Area,aims to verify the relationship between high-tech enterprises agglomeration and economic growth.Empirical evidence shows that 1)considering the effects of the cubic item,agglomeration has two inflection point effects on economic growth,showing a trend that decreasing comes first,followed by increasing and then it shifts to decreasing;2)the degree of agglomeration in most citie...