May be caused by the manufacturer's production of goods of the same type that the buyer's reliance on raw materials and intermediate goods, between producers worth the investment to build the industrial park?
May be due to the concentration of manufacturers producing the same product, the buyer is known to rely on raw materials and intermediate products during the manufacturing cost of the investment is to build their estates.
May be due to the concentration of the manufacturers who produce the same product make it known of buyers ้อกา techniques rely on raw materials and intermediate products between manufacturers investment value creation as its industrial estates