International monetary systems are sets of rules and institutions that facilitate international trade and investment flows. A good system allows quick and low-cost balance of payments adjustments, maintains stable exchange rates to promote confidence, and provides liquidity to address temporary deficits. Historically, systems have included bimetallism, the classical gold standard, Bretton Woods, and currently either fixed or floating exchange rates. Exchange rate regimes impact exporters and importers - depreciation boosts exports but hurts imports, while appreciation has the opposite effects. Businesses are also indirectly impacted through higher import costs or currency conversion fees on international payments.