This, basically, is the logic of Keynesian economics, which says that governments have a role to play in macro-economic management through policy tools: monetary exchange rate and budget policy.
In principiu, acesta este rationamentul economiei keynes-iene, care spune ca guvernele au un rol de jucat in managementul macroeconomic prin instrumente ale politicii economice: cursul de schimb si politica bugetara.