Markedet og økonomitrender15.07.2015 The Primary Deficit Sustainability Framework The PDS is a tool used to define sustainable deficits for economies and a way to monitor public finances. This analytic framework, which can be expressed as an equation, measures whether national debt and deficits are sustainable, when the trend in deficits could cause a loss of confidence and rapidly increasing borrowing costs for a given country. AWH Capital Privatperson 17