A constant unit of account
Theoretically a global perfectly stable unit of fixed constant real value would be equal to one monetary unit in a world economy in a global monetary union with a single currency under indefinite perfectly sustainable zero inflation.
In an ideal world, there would be one global currency subject to neither inflation nor deflation, nor political manipulation by any one or group of countries.
Neither of the two economic environments described above are very likely to be achieved. It is thus much more likely that a single unit of constant real value will come about via a global non–monetary index in a multi–currency world economy.
Nicolaas Smith
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