William Petty,
Political Arithmetick — Chapter X
“ To which purpose it is to be remembred, That all the Commodities, yearly Exported out of every part of the last mentioned World, may be bought for forty five Millions; and that the Shipping employed in the same World, are not worth above fifteen Millions more, and consequently, that sixty Millions at most, would drive the whole Trade above mentioned, without any trust at all. ”
