'pro-monopoly' is a compound formed from the prefix 'pro-' (from Latin 'pro', meaning 'for' or 'in favor of') combined with 'monopoly' (from Greek 'monopolion').

'monopoly' comes from Greek 'monopolion' (from 'monos' meaning 'single' + 'polein' meaning 'to sell'), passed into Late Latin and Old French, entered Middle English as 'monopolye', and became modern English 'monopoly'. The modern compound 'pro-monopoly' arises by combining the prefix with the established noun.

Initially, 'monopoly' meant an 'exclusive right to sell' or exclusive control in trade; 'pro-monopoly' historically described support for such exclusive rights and has retained the sense of favoring exclusive market control, now often used in political or economic contexts.