In broad, diversified metropolitan areas, for instance, the regional growth path might benefit from a large variety of urbanization instead of localization economies. 更廣泛一點，例如，不同的大都市地區，區域發展途徑可能收益於大都市代替地方化經濟這一大的變化。
But the aggregated economy effect including urbanization effect and localization effect tends to decline when the cities' population is beyond a certain size. 但是在達到一定城市規模以後，城市人口規模越大，包含地方化經濟和城市化經濟的聚集經濟效應呈現遞減趨勢。
