The agio of the bank of Hamburgh, for example, which is said to be commonly about fourteen per cent, is the supposed difference between the good standard money of the state, and the clipt, worn, and diminished currency poured into it from all the neighbouring states.
'Before 1609 the great quantity of clipt and worn foreign coin, which the extensive trade of Amsterdam brought from all parts of Europe, reduced the value of its currency about 9 per cent below that of good money fresh from the mint.

Such money no sooner appeared than it was melted down or carried away, as it always is in such circumstances.

The merchants, with plenty of currency, could not always find a sufficient quantity of good money to pay their bills of exchange; and the value of those bills, in spite of several regulations which were made to prevent it, became in a great measure uncertain.
'In order to remedy these inconveniences, a bank was established in 1609 under the guarantee of the City.

This bank received both foreign coin, and the light and worn coin of the country at its real intrinsic value in the good standard money of the country, deducting only so much as was necessary for defraying the expense of coinage, and the other necessary expense of management.

For the value which remained, after this small deduction was made, it gave a credit in its books.