What are Williamsons 4 types of asset specificity?

1. Site specificity: You have invested in production facilities located close to each other 2. Physical asset specificity: Investing in assets that can be used only if the supplier / customer relationship is maintained 3. Human asset specificity: Investing in human capital that can be used only if the supplier / customer relationship is maintained 4. Dedicated assets specificity: Investing in sufficiently large plants to utilize cost advantages. Only profitable as long as the customer relationship is maintained.