What different considerations on the part of investors drive foreign direct investments (FDI) as opposed to portfolio investments?

What different considerations on the part of investors drive foreign direct investments (FDI) as opposed to portfolio investments? What is the role of bilateral investment treaties in regulating FDI? What has prevented the creation of comprehensive rules to regulate FDI? Do you agree that a compelling need for international regulation of FDI and the activities of multinational corporations exists? Why or why not?

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