Investors face defaults on government bonds given the burden of ageing populations and the challenge of increasing tax revenue, according to a Morgan Stanley executive director based in London. Ireland's debt to government revenue ratio is high but lower than US.

Arnaud Marès, who has worked at the UK's debt management agency, says that the conventional debt/GDP (gross domestic product) ratio does not compare debt to a government’s ability -- or willingness - -  to pay. When measured against government revenue, the US debt position, for instance, is worse than Greece’s and Ireland is third in a ranking of 9 countries.

The sovereign debt crisis is not European: it is global. And it is not over. Marès says the European sovereign debt crisis of spring 2010 was a misnomer in more ways than one: there was not one crisis but two. And it will continue well beyond 2010, in the MS view. The first crisis was, and remains, an institutional crisis of the euro, caused by a flawed multilateral fiscal surveillance framework. Steps have been taken towards a correction of the flaws with a move from peer pressure to peer control of fiscal policy. The second crisis was, and remains, a sovereign debt crisis: a crisis caused by sovereign balance sheets being overstretched, to the point where insolvency ceases to be merely possible and becomes plausible. This crisis is not limited to the periphery of Europe. It is a global crisis and it is far from over. We take a high-level perspective on the state of government balance sheets and conclude that debt holders have to be prepared to enter an age of ‘financial oppression'.

Debt/GDP has been higher before, so why worry? Marès says as government debt and deficits have swollen to levels for which there exist few recent references, all eyes have turned to a more distant past in the hope of finding some guidance as to what future awaits bondholders. At first glance, history appears to be reassuring, though that is deceptive. Several advanced countries have experienced debt/GDP levels well in excess of current ones. The US emerged from Word War II with a public debt/GDP ratio of approximately 110%, and the UK with a ratio of 250%. The UK national debt has averaged almost 100% of GDP since its creation in 1693. Yet the UK government never defaulted through that period. France's public debt stood at about 280% of GDP at the end of World War II. It did not default either. As a matter of fact France defaulted only once - in 1797 - since the creation of its own national debt in 1789. This is remarkable, considering the number of political, military and economic crises the country went through. So why worry now he asks?

Four reasons why debt/GDP misses the point. The problem with these historical comparisons is not the reference: how governments dealt with their war debt burdens sheds useful light on what might be in store for coming years. Rather, the problem lies with the measurement tool: debt/GDP is the most widely used debt metric, but Marès says it is a very inadequate indicator of government solvency. There are four reasons for this:

• Gross versus net debt: First, debt/GDP is a measure of gross indebtedness. It therefore overstates the size of the government's net financial liabilities, especially when - - as has been the case through the crisis - - debt is being raised for the purpose of on-lending or acquiring assets. Where measures of net debt exist, they provide an apparently less alarming picture of the government's balance sheet. The difference can be sizeable (in excess of 17% of GDP in the UK currently, for instance). Good news, however, stops here.

• Missing liabilities: The second flaw of debt/GDP is that it only accounts for part of a government's contractual liabilities. There exists a broad range of liabilities that are debt, yet are not captured in national accounts. To take one example, in March 2008 the UK Government Actuary Department valued the government's unfunded civil service pension liabilities - that is, the contractual claims on government accumulated to date by civil servants - at £770 billion. That is 58% of GDP, not captured by the debt/GDP ratio. Debt/GDP does not capture contingent liabilities either.

• It is not GDP but government revenues that matter: Whatever the size of a government's liabilities, what matters ultimately is how they compare to the resources available to service them. One benefit of sovereignty is that governments can unilaterally increase their income by raising taxes, but they will only ever be able to acquire in this way a fraction of GDP. Debt/GDP therefore provides a flattering image of government finances. A better approach is to scale debt against actual government revenues. An even better approach would be to scale debt against the maximum level of revenues that governments can realistically obtain from using their tax-raising power to the full. This is, inter alia, a function of the people's tolerance for taxation and government interference. Seen from this angle, the US federal debt no longer compares quite so favourably with that of European governments.

• Debt/GDP looks at the past. The main problem is in the future: The fourth and largest flaw of debt/GDP is that it is an entirely backward-looking indicator. It only accounts for the accumulation of past deficits. This captured reasonably well the magnitude of the fiscal challenge at the end of World War II because at that time the challenge did indeed result entirely from the past: large wartime deficits had pushed debt ratios higher, but governments were no longer running deficits, nor were there expectations of them doing so in subsequent years.

By contrast, the accumulation of past deficits now represents only part of the problem for advanced economies' governments. The other part consists of coping with the large structural deficits opened up by the crisis and compounded by the fiscal consequences of ageing. What raises questions about debt sustainability is not so much current debt levels as the additional debt that will accumulate in coming years if policies do not radically change. Debt ratios do not capture this part of the problem.

The European Union has received a letter from nine of its members calling for a change in the way the debt of EU countries is calculated. Peter Attard Montalto from Nomura has analysis:

Looking beyond debt: valuing government equity. Marès says a comprehensive look at government balance sheets provides a much gloomier reading of their solvency. He says the difference between the power to tax and the social liability is the net present value of all future structural primary deficits (by definition, the cyclical component of the deficit should sum up to zero over time).

The residual is represented on the balance sheet as the people's equity, by analogy to a corporate balance sheet. This is effectively the net worth of the government in the broadest sense, and a measure of its solvency. It can be interpreted very simply as follows: if positive, the government can release value to taxpayers by lowering taxes without reneging on its promises to other stakeholders (bond holders and beneficiaries of public services). If negative, the government is insolvent. In other words, some or all of its stakeholders must suffer a loss: either taxpayers (through a higher tax burden), or beneficiaries of public services (through lower expenditure) or bond holders (through some form of default).

Adding the cost of ageing to that of the crisis. An estimate of government ‘equity' value can be obtained by adding the net present value of all future primary deficits to existing financial debt. Future primary deficits result from two influences:

• Current structural deficits, opened up or aggravated during the crisis by the permanent loss of tax revenues that accompanies a permanent loss of output. This is the part of the deficit that will remain - once temporary stimulus measures are withdrawn and growth has returned to trend - under an assumption of unchanged policies;

• The additional structural deficit that - under the same assumption of unchanged policy - would gradually result from ageing, mostly through a rise in health and pension expenditure.

Marès says the fiscal challenge is unprecedented. He provides illustrative estimates of government net worth under this approach. What matters here, he says,  is not the exact numbers, which are very dependent on underlying assumptions. What matters is the sign of net worth (negative everywhere), its broad order of magnitude (a large multiple of current or historical debt levels almost everywhere) and the ranking of governments.

This depressing perspective on global public finances is not exactly news. The same calculations based on pre-crisis data were not nearly as bad, but not significantly more encouraging either, with most governments already then in negative equity. The crisis has had three noticeable effects nonetheless:

• It has aggravated the problem everywhere, mostly through a permanent shock to tax revenues and through a transfer of liabilities and risk from the private to the public sector, without a commensurate transfer of resources.

•  In doing so, it has intensified the inherent conflict that exists between bond holders and other government stakeholders that all compete for resources that are finite and, crucially, insufficient to satisfy all their claims - to the point where holders of government debt have started contemplating default as a plausible outcome rather than a mere theoretical possibility...

• ...which, in turn, considerably shortened the time available to governments to resolve this conflict one way or the other, with a loss of market access a credible penalty for procrastination.

It is not whether to default, but how, and vis-à-vis whom. Marès says what this means is that - as indicated above - governments will impose a loss on some of their stakeholders and have in fact started to do so (across Europe at least). The question is not whether they will renege on their promises, but rather upon which of their promises they will renege, and what form this default will take. From the perspective of sovereign debt holders, this translates in two questions:

• Does their claim on governments rank senior enough relative to other claims to fully shelter them from losses?

• If it does not, what form will this loss take?

Bonds remain the most senior government liability. The MS director says there are good reasons why government bonds should rank senior to most other liabilities. To mention one: governments need to be able to raise finance to fund public investment as well as to perform their macroeconomic stabilisation role. They cannot issue equity, and cannot credibly issue secured debt. Unrestricted access to unsecured, confidence-based funding is core to their ‘business model', as it is for banks. This was, historically at least, the main argument for honouring sovereign debt. There are others, not least the consequences of a government default for output and for financial stability when banks own substantial exposure to the sovereign.

Bond holders have been fully sheltered from loss through the Great Recession - so far. The MS director says this seems consistent with historical experience, both from yesteryear and yesterday. So far indeed, holders of sovereign debt have been exempt from sharing in the loss of income and wealth that has affected everybody else: shareholders have absorbed direct losses. Homeowners have faced (uneven) losses of property value. Taxpayers have experienced a reduction in their lifetime income through current and prospective increases in taxation. Government employees and other stakeholders are suffering even larger losses through current or prospective reduction in government expenditure. Only holders of senior unsecured debt issued by the largest governments and - in most cases - banks have been sheltered so far.

Can this realistically continue forever? He says this is ultimately a question of political economy and adds itt is worth noting that, in the case of Greece, public acceptance of austerity measures - cuts in civil service compensation in particular - has become conditional on the perception that the cost of fiscal retrenchment would be distributed fairly across constituencies (hence the very public crackdown on wealthy tax evaders). Whether and when bond holders are asked to share in the common pain - not just in Greece - depends on:

• The intensity of the conflict that opposes them to other stakeholders. As discussed earlier, this is likely stronger than it has ever been; and

• The extent to which the interests of bond holders are aligned with those of the most politically influential constituencies.

Financial oppression as an alternative to outright default. Marès says outright default is not the only way to impose losses on creditors. Financial oppression - - the fact of imposing on creditors real rates of return that are negative or artificially low - - can take other forms: repaying debt in devalued money (e.g., through unanticipated inflation), taxation or regulatory incentives on institutions to purchase government debt at uneconomic prices, for instance. Repaying debt in devalued money is particularly effective when the initial stock of debt is high - as it is now. Distorting prices in the government's favour is particularly effective when the financing requirement is high - also a situation we face now and for years to come.

History is not so reassuring after all. He says financial oppression has taken place in the past as an alternative to default in countries that are generally considered to have a spotless sovereign credit record. Examples include: the revocation of gold clauses in bond contracts by the Roosevelt administration in 1934; the experience by then Chancellor of the Exchequer Hugh Dalton of issuing perpetual debt at an artificially low yield of 2.5% in the UK in 1946-47; and post-war inflationary episodes, notably in France (post both world wars), in the UK and in the US (post World War II). Each took place at a time when conflicting demands on finite government resources were high, and rentiers wielded reduced political power.

The interests of bond holders are no longer perfectly aligned with those of the most powerful constituency. Marès considers the rapid increase in the age of the median voter in large western European countries. In principle, having governments and policies shaped by older voters ought to be favourable to bond holders, because bonds are more likely to be held by the old than the young and policies that would harm bond holders would often also harm the old (inflation for instance redistributes wealth from the old to the young). He says the first problem with this argument is that the constituency of the elderly is also the biggest competitor to bond holders because of the considerable size of the direct claim it has on the government balance sheet in the form of pensions, social security and health insurance, etc. The more reluctant they are to relinquish these claims, the higher the risk for bond holders. The second problem is the dilution of bond ownership, which results in lesser alignment of the interest of bond holders with older voters: even in the UK, where the domestic and pension industry has traditionally dominated the gilt market, its ownership of gilts has decreased in recent years from around 60% to 40% of the market (excluding Bank of England purchases), to the benefit of foreign investors.

No insurance against financial oppression at current yield levels. Against this background, Marès says it seems dangerously optimistic to expect that sovereign debt holders can be continuously and fully sheltered from partaking in the loss of wealth and income that has affected every other group. Outright sovereign default in large advanced economies remains an extremely unlikely outcome, in our view. But current yields and break-even inflation rates provide very little protection against the credible threat of financial oppression in any form it might take. He says that a double-dip recession would not invalidate this conclusion: it would cause yet further damage to the governments' power to tax, pushing them further in negative equity and therefore increasing the risks that debt holders suffer a larger loss eventually.

Finfacts article: Global interest rates may remain low for at least 20 more years

MS illustrative estimates of government net worth are based on the following assumptions:

Initial debt level: For the purpose of simplicity, consistency and availability of data across countries, MS uses the projected debt level of gross debt/GDP at end-2010 - even though the correct aggregate to use here is clearly net financial debt. This has no material bearing on the conclusions of the exercise. 

Structural deficit: The exact size of the structural deficit is a guesstimate at best - it requires an assessment of potential GDP, a notoriously imprecise concept. Calculations are based on official projections of cyclically adjusted primary deficits in 2011, and MS assumes that this deficit is unchanged in every subsequent year (as a percentage of GDP). This is consistent with the assumption of ‘unchanged policy'. In practice governments do intend to change policy - - and thereby to reduce the size of the structural deficit. In doing so they inflict a loss on taxpayers (if raising taxes) and on other stakeholders (when cutting expenditure). As the purpose of the exercise is precisely to evidence the magnitude of the loss that these will suffer, assuming an unchanged structural deficit at current levels is the appropriate reference point. It is for this same reason that MS uses as a reference point 2011 and not 2010 data: the latter is still distorted in some countries by stimulus measures, which, being temporary by nature, never constituted a ‘promise to spend'. The removal of the stimulus measure does not therefore inflict on stakeholders a loss as MS defines it.

Cost of ageing: Estimates of the cost of ageing on public finances - even under unchanged policy - - rely heavily on demographic and economic projections. For the purpose of our illustrative calculations, MS used long-term projections of age-related expenditure published by the EU and - - for the US - - by the IMF. For the same reason as above, the reference point is pre-fiscal retrenchment, i.e., the calculation does not take account of the ongoing pension or healthcare reforms decided or being discussed this year in many countries.

Discount rate: The net present value of future fiscal deficits is naturally heavily dependent on the discount rate used. The calculations assume a discount rate 100bp (1%) above the nominal GDP growth rate across all countries.