If the competition for a certain material is too intense, and the opportunity to be awarded with the supply contract for the item is likely diminished for the small-sized companies and therefore it is feared that a handful of companies may monopolize the market in a competitive tender limited to SMBs, the manufacturers are classified into Medium-sized Enterprises, Small-sized Enterprises, and Small Businesses to expand the opportunity to participate in the tenders depending on their classes, in order to increase the business opportunities for the small-sized businesses.