For the market to work efficiently - currency issue should be from the bottom up. This ensures an equitable distribution of voting rights in the market (at least initially.) The National Provision (Citizens Dividend in Europe), goes some way towards achieving this - although in a truly global economy this principle should be applied on a global scale rather than a national scale.
The correct amount of such currency issued can be easily controlled by basing the tax system upon land taxes, and issuing a quantity of currency equal to total tax receipts due. This is best done at local government/authority level, for reasons outlined here:
http://inord.laurentian.ca/6_02/Henry_George.htmhttp://inord.laurentian.ca/Toolkit/CT7-Henry_George2.htmIf currency is issued top down, and financial wealth is overly concentrated, then no matter how the currency is removed from circulation - its flow will be short circuited.