But for an economy where foreign firms are so dominant, GNP, or the income that goes to residents, is more relevant.
In 2002, Mr Castronova famously calculated the GNP per capita of the fictional game-world of "EverQuest" as $2,000, comparable to that of Bulgaria, and far higher than that of India or China.
Even the opposition GNP, says Park Jin, a member of the party, believes in maintaining dialogue with the North, while adding some pressure.It is a path that is likely to lead South Korea increasingly into conflict with America, which wants stiffer confrontation with the North.
When the presidential Blue House vetoed such a bill last week, the GNP reacted by boycotting parliament.
"Only to have a higher cumulative GNP than the Americans?
The hydropower projects are mostly "run-of-the-river" schemes with far less impact on the environment, and far less human displacement, than huge dams would have.This wonderful record has a cost, of course, and, as a guide to policy, it is where GNH parts company from GNP.
It has since signed up 15m users, is used by 70% of the adult population and has become central to the economy: around 25% of Kenya's GNP flows through it.Similar schemes have had some success elsewhere.
Leon Lederman, a particle physicist whose credentials include the discovery of the muon and the bottom quark (two of the fundamental particles in the universe), reckons that quantum phenomena already feature in technology that accounts for a quarter of America's GNP.
That is a substantial sum for a country whose GNP barely reaches $80 billion at purchasing-power parity.The sprouting of fancy shopping centres, yacht marinas and housing developments along Tunisia's breezy coast provided a shiny veneer of prosperity.
The GNP has a solid majority in the assembly, hence the DP's physical tactics democratic process go hang.
They agreed (the United States among them) to "urge the developed countries that have not done so to make concrete efforts towards the target of 0.7% of GNP as ODA [official development assistance] to developing countries".
