Title: A System of international comparisons of gross product and purchasing power
Subjects: Gross national product, Income, Purchasing power, Statistics, Income and wealth, Nationaal product, Revenu, Koopkrachtpariteit, Produit national brut, Kaufkraftvergleich, Consumo (Economia), Internationaler Vergleich, Sozialprodukt, Kaufkraft, Prices, Pouvoir d'achat