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English: PPF of two material goods, illustrating trade-off + PPF of material good and digital information, illustrating the concept of eternal free lunch.
Detta verk har gjorts tillgänglig som public domain av dess skapare, Cnelson. Detta gäller globalt.
I vissa länder kan detta inte vara juridiskt möjligt; i så fall: Cnelson ger envar rätten att använda detta verk för alla ändamål, utan några villkor, förutom villkor som lagen ställer.