(2) Reduce production costs and expand labor-intensive sales markets.

(3)① The geographical location is close to Japan and South Korea; ② The labor force is cheap and abundant; ③ Broad market; (4) Good industrial foundation and perfect infrastructure.

Japan and South Korea moved to Shandong mainly for labor-intensive industries. Shandong is close to Japan and South Korea, with abundant labor force, good industrial foundation and broad market. In order to reduce production costs and seek the best location, Japanese and Korean enterprises transfer labor-intensive industries to the peninsula urban agglomeration with Jinan and Qingdao as the core.