Well in the Norwegian case the oil itself fuels economic activity, that growth and maintenance is purchased, the profit has to go somewhere, it goes into asset ownership. In a long sense they are trading oil in exchange for ownership of what uses oil.
I don’t think it’s to weaken their currency so much as they have been paid more than they can use the money to stimulate jobs and therefore more production. What’s left is basically a debt to them for their oil that transfers into a higher rate of aggregate ownership. They don’t have that much wealth at home, no bidding will go to inflate domestic company value before they would chose ownership of foreign assets.
Dunno what the Swiss are doing.
To your first paragraph, yes. They're loosing oil into the globe and trading it for claims on future productivity (or rents).
But they definitely have to spend the profits into international markets in order to prevent their currency from rising and rising. Norway has been pretty good at avoiding Dutch Disease, by not letting oil exports capture too much of their economy. But this mostly means that they save enough of the revenue therefrom and then spend that revenue back into the international markets (through asset purchases). They then have a nifty mandate where they spend some of their capital wealth annually.
The Swiss have to devalue their currency by literally printing francs and trading them for international assets. So, just like Norway's Sovereign Wealth fund goes up and up, so does the Swiss Central Bank's asset sheet. But, unlike Norway, the Swiss very much do not spend some of the assets annually (or, er, very much at all) but will use the assets to prop up their currency as required.
They're giant pools of wealth, held under different accounting systems. But Norway got theirs by selling oil to people who'd foist the externalities onto the global poor, in exchange for foreign capital assets. Feel free to find a better source, but if someone doesn't believe in carbon offsets or in capital ownership, Norway isn't a good example of (afaict) 'real' Socialism.
This is part of why captial 'S' Socialism needs a success story. Now, I've never done in-depth looks at Sweden, but a lot of their turnaround happened after they dismantled some of their left(ish) systems that had gone too far. Or, it's what I've heard.
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