Simultaneous policy requires governments in all jurisdictions at once, worldwide, to implement a policy shift at once, so that none is disadvantaged.

The principle, and the International Simultaneous Policy Organization, or ISPO, to promote it, were initially created by John M. F. D. Bunzi. It is not however a new idea, it being the basis of treaty and United Nations initiatives that nothing can be done on some problems, like disarmament, until all major players agree to a common timetable of implementing solutions.

The International Labour Organization and GlobalGreens both recommend certain simultaneous policy initiatives, and closer coordination of their members in many nations. Such cooperation is seen as a way to work within a competitive global market economy without disadvantaging the most 'progressive' players who strongly protect ecology and the worker.

Simultaneous initiatives are seen as a way to avoid Prisoner's dilemma type problems, wherein there is a strong reward for defecting, and a risk for going along with a proposed plan if there is even one defector.

Another example problem of this nature is agricultural subsidies to domestic farmers. A nation abolishing such subsidies stands to lose much of its family farm infrastructure to cheap imports unless a simultaneous initiative in another country, or in tax, tariff and trade to make up for lost subsidies, takes place. As this example suggests, the policies that are put in place simultaneously may be more complex than initially realized, and may require the cooperation of multiple branches or levels of government within one country, in addition to global cooperation.

See also: treaty, diplomacy, hegemony, world government