Originally from  Jurisdiction in Investment Treaty Arbitration - IAI Series No. 8

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These remarks endeavor to answer the question, does the consent of the contracting parties govern the requirement of an “investment” as specified in Article 25 of ICSID’s formative instrument, the ICSID Convention?

The short answer to that question is, no, the terms of the consent of the contracting parties do not of themselves determine what is an “investment” within the meaning of Article 25.  But the terms of the consent of the contracting parties to ICSID’s jurisdiction must be accorded, if not determinative weight, then great weight in deciding whether the requirement of an investment under the ICSID Convention is met.

Article 25(1) of the ICSID Convention provides that:
The jurisdiction of the Centre shall extend to any legal dispute arising directly out of an investment between a Contracting State . . . and a national of another Contracting State, which the parties to the dispute consent in writing to submit to the Centre.

Article 25(4) provides that:
Any Contracting State may . . . notify the Centre of the class or classes of dispute which it would or would not consider submitting to the jurisdiction of the Centre.