David Ricardo,
On The Principles of Political Economy…
“ Such a currency is necessarily confined to the country where it is issued: it cannot, when too abundant, diffuse itself generally amongst other countries. The level of circulation is destroyed, and the exchange will inevitably be unfavourable to the country where it is excessive in quantity: just so would be the effects of a metallic circulation, if by forcible means, by laws which could not be evaded, money should be detained in a country, when the stream of trade gave it an impetus towards other countries. ”
