english: This is because of something called marginal utility, and it means that when you choose between diamonds and water, you compare utility obtained from every additional bottle of water to every additional diamond.
non_english: To je zbog nečeg što se zove marginalna korisnost, a to znači da, kada birate između dijamanata i vode, upoređujete korisnost koju dobijate od svake dodatne flaše vode sa svakim dodatnim dijamantom.