the key strategy at this time was to foster the growth pole which geographically corresponded to the socalled gyungbu corridor linking seoul to busan and ulsan the government used public resources and external borrowing to finance the work focusing first on manufacturing and services in seoul it then went on to create the heavy industry base along the southeast coast by building such industrial cities as ulsan the construction of which began in and a number of other industrial estates in that region during the s and s to improve efficiency the government s investment was concentrated on the high priority areas of seoul incheon and ulsan so as to facilitate accessibility to human resources subsidiary material product sales and infrastructure