Originally posted 17 November 2007, this Vox column is more relevant than ever arguing that adopting the euro is effectively irreversible. Leaving would require lengthy preparations, which, given the anticipated devaluation, would trigger the mother of all financial crises. National households and firms would shift deposits to other Eurozone banks producing a system-wide bank run. Investors, trying to escape, would create a bond-market crisis. Here is what the train wreck would look like.

Official statistics for US high school graduation rates mask a growing educational divide. This column presents research showing that a record number of Americans are going to university – while an increasing number are dropping out of high school. This poses major social challenges for the United States.

Debt is the crux of advanced economies’ current policy debates. Some argue for fiscal expansion to avoid recession and deflation. Others claim that you can’t solve a debt-created problem with more debt. This column explains the core logic of a new model by Eggertsson and Krugman in which debt shocks and policy reactions can be examined. Relying on heterogeneous agents, the model naturally produces the paradox of thrift but also finds new supply-side paradoxes, those of toil and flexibility. The model suggests that most economists have been misthinking the issues and that actual policy in the US and EU is misguided.

The 'Scramble for Africa' – the artificial drawing of African political boundaries among European powers in the end of the 19th century – led to the partitioning of several ethnicities across newly created African states. This columns shows that partitioned ethnic groups have suffered significantly longer and more devastating civil wars. It also uncovers substantial spillovers as ethnic conflict spreads from the historical homeland of groups partitioned to nearby areas where non-split ethnicities reside.

The CEPR Press eBook on secular stagnation has been viewed over 80,000 times since it was published on 15 August 2014. The PDF remains freely downloadable, but as the European debate on secular stagnation is moving into policy circles, we decided to also make it a Kindle book. This is available from Amazon; all proceeds will help defray VoxEU expenses.

Despite the revolutionary technological advance of the printing press in the 15th century, there is precious little economic evidence of its benefits. Using data on 200 European cities between 1450 and 1600, this column finds that economic growth was higher by as much as 60 percentage points in cities that adopted the technology.

The European economy is in its deepest recession since the 1930s. This column says that swift policy response avoided a financial meltdown, but turning the ongoing recovery into sustained growth requires action on five challenges: boosting potential output, enhancing labour market flexibility, preparing fiscal consolidation, facilitating intra-EU adjustment, and unwinding global imbalances. Europe also needs an improved crisis-management framework, lest this happen again.

Societies characterised by a high transmission of socioeconomic status across generations are not only more likely to be perceived as ‘unfair’, they may also be less efficient as they waste the skills of those coming from disadvantaged backgrounds. Existing evidence suggests that the related earnings advantages disappear after several generations. This column challenges this view by comparing tax records for family dynasties (identified by surname) in Florence, Italy in 1427 and 2011. The top earners among the current taxpayers were found to have already been at the top of the socioeconomic ladder six centuries ago. This persistence is identified despite the huge political, demographic, and economic upheavals that occurred between the two dates. 

Obesity and teenage sex have become social and public health issues in developed countries. This column looks at the effects of being overweight on attitudes to sex among teenage girls in the US. While obesity is associated with less vaginal intercourse, overweight teenage girls are at least 15% more likely to have had anal sex, with a high chance of sexually transmitted disease.

Both economics and geopolitics matter for trade agreements. In particular, defence pacts raise the probability of a trade agreement between a pair of countries by as much as 20 percentage points. This column estimates that were the US to alienate its geopolitical allies, the likelihood and benefits of successful bilateral agreements would diminish significantly. Expected trade creation from an agreement between the US and EU countries would decline by 0.6% of total US exports.

Dealing with uncertainty about the state of the economy is one of the main challenges facing monetary policymakers. In recent years there has been an extensive debate on the value of some of the deep parameters driving the economy, such as the natural rate of interest and the slope of the Phillips curve, estimates of which are quite uncertain. This column argues that when facing uncertainty on the structural relationship among macroeconomic variables, central banks should adopt a pragmatic and data-dependent approach to adjusting their monetary policy stance. 

The house and equity price busts on top of a credit crunch make this an unprecedented crisis for the modern US economy; its real economy effects are thus difficult to assess. This column provides insights based on evidence from 122 recessions in 21 advanced nations since 1960. Findings suggest recessions in such circumstances are much costlier and slightly longer. But the outcome can be affected by policy, and it’s high time that policymakers act swiftly and decisively.

The top 1% of US earners now command a far higher share of the country's income than they did 40 years ago. This column looks at 18 OECD countries and disputes the claim that low taxes on the rich raise productivity and economic growth. It says the optimal top tax rate could be over 80% and no one but the mega rich would lose out.

Labour markets in US cities today are vastly more educated and skill-intensive than they were 50 years ago, but urban non-college workers now perform much less skilled work than they did. This column shows that automation and international trade have eliminated many of the mid-skilled non-college jobs that were disproportionately based in cities. This has contributed to a secular fall in real non-college wages.

Previous research has shown that changes to the size of the ECB’s balance sheet were followed by meaningful changes in macroeconomic aggregates. This column argues that the econometric technique these studies employed does not provide reliable estimates. Impulse responses to purported balance sheet shocks are statistically indistinguishable from those from nonsensical identification schemes. The effectiveness of the ECB’s balance sheet policies is therefore still unproven.

EU and the UK production networks are highly integrated, and Brexit poses a threat to supply and demand linkages between the two economies. This column describes how the effect of tariffs will be magnified due to back-and-forth trade across the Channel. This will increase production costs in the UK and, to a lesser extent, in the EU.

More than one billion adults across the globe are overweight, and at least 300 million are clinically obese. This column argues that the obesity epidemic in the US has been creeping up throughout the twentieth century, much earlier than the official account acknowledges. Current US standards thereby mislead many overweight and obese youth into believing that their weight is normal when it is not.

The problem of tax compliance is as old as the levying of taxes. Innovations in tax administration that induce high compliance rates at reasonable cost are extremely important to governments. This column demonstrates how the taille, a tax collection mechanism from medieval Paris, raised compliance by turning the social cost of tax evasion into a private one. It offers a tax collection model that is still relevant to governments today.

We may just have started to feel the pain. Asset price drops – including housing – are common markers in all the big banking crises over the past 30 years. GDP declines after such crises were both large (-2% on average) and protracted (2 years to return to trend); in the 5 biggest crises, the numbers were -5% and 3 years. This column, based on the author’s testimony to the Congress, picks through the causes and consequences. It argues that when it comes to ‘cures,’ it would be far better to get the job done right than get the job done quickly.

Hot countries tend to be poorer, but debate continues over whether the temperature-income relationship is simply a happenstance association. This column uses within-country estimates to show that higher temperatures have large, negative effects on economic growth – but only in poor countries. The findings are big news for future global inequality.

Alongside liquidity and store of value, is privacy an important attribute of money? Using laboratory experiments, the column shows that privacy matters, and increases the overall appeal of money. The experiments suggest that future competition between alternative currencies will depend on how the three properties are mixed.

Bitcoin and related cryptocurrencies are exchanged via simple technical protocols for communication between participants, as well as a publicly shared ledger of transactions known as a blockchain. This column discusses research on how cryptocurrencies verify that payments are final, that is, that they are irreversible once written into the blockchain. It points to the high costs of achieving such finality via ‘proof-of-work’ and to a crucial externality in the transaction market, and argues that with the current technology, the liquidity of cryptocurrencies is set to shrink dramatically in the years to come.

Britain eschewed EU membership in the late 1950s but changed its mind in the early 1960s, only to be rebuffed by Charles de Gaulle. Membership came only in the early 1970s. This column argues that, among others, Britain joined the EU as a way to avoid its economic decline. The UK’s per capita GDP relative to the EU founding members’ declined steadily from 1945 to 1972. However, it was relatively stable between 1973 and 2010. This suggests substantial benefits from EU membership especially considering that, by sponsoring an overpowered integration model, Britain joined too late, at a bad moment in time, and at an avoidably larger cost.

Global growth is slowing – especially in advanced-technology economies. This column argues that regardless of cyclical trends, long-term economic growth may grind to a halt. Two and a half centuries of rising per-capita incomes could well turn out to be a unique episode in human history.