This article proposes that all new Euro area sovereign borrowing be in the form of jointly underwritten 'Euro-insurance-bonds' trading at the same price for outside investors. To avoid classic moral hazard problems and to insure the guarantors against default, each country would pay a risk premium conditional on economic fundamentals to a joint debt management agency. While sovereign debt markets have taken increasing account of economic fundamentals, the signal to noise ratio was weakened by market volatility, so undercutting incentives for appropriate reforms and obscuring economic realities for voters. Formula-based risk spreads based on fundamentals, informed by a new econometric model, would provide clear incentives for governments to be more oriented towards economic reforms to promote long-run growth rather than mere fiscal contraction. Putting more weight on incentives that come from risk spreads, than on fiscal centralisation and the associated heavy bureaucratic procedures, would promote the principle of subsidiarity. Large cost savings for European taxpayers are likely.