Industries locate around Osaka Bay because there is a skilled and plentiful workforce, many port facilities, efficient linkages (from small to medium to large firms). There are good transport links (including the Shinkansen), room for expansion (land reclaimed from the sea), and a large local market (9 million).
There has been a recent economic change in Osaka Bay: The decline of older 'heavy' industries such as Nippon Steel, and the expansion of 'new tech' companies such as ICT. There has been a growth in the quaternary industries — research, development, and information. There has also been a development in the science parks and the building of new motorways; this has meant the loss of the countryside.