and restricts the expensive data collection process. It is a cross between economic base and input-output and divides the economy into a limited number of major sectors and minor sectors. The major sectors would be made up of large, predominrntly basic firms, experiencing considerable change and hence exerting considerable influence on the regional economy.
ซึ่งเป็นเทคนิคที่ช่วยลดความยุ่งยากความสัมพันธ์นำเข้าและส่งออก