A major oil spill will result in cleanup spending that boosts GDP, but no one thinks oil spills are good. Oil spills and other forms of pollution are examples of negative externalities — harm caused to others by the economic activity of a firm or industry. These externalities represent a failure of the market, and unless there is corrective action, their presence means that there is too much production of something that causes negative spillovers.

That criticism can be applied to the financial services industry. Many say that it grew too large, triggered a financial crisis and damaged the rest of the economy. Is that still the case, and is financialization spoiling the economy? Despite the alarmist rhetoric around today’s finance sector, the answer is generally “no” because of changes made to financial regulation.

First, a check on the facts: How large is the industry and how much has it grown? The broad definition of the financial sector includes finance, insurance and real estate, known by the acronym “FIRE.” It was 17.5 percent of gross domestic product in 1990 and rose to 20.0 percent in 2014, but that figure is misleading as it includes office and apartment rents and leases — stuff that has little to do with Wall Street.

Finance and insurance separately peaked well before the financial crisis at 7.7 percent of GDP, which was up from 5.8 percent in 1990. In 2014, it was 7.0 percent of GDP. Employment in finance and insurance has been on a downtrend since 2003 and is currently 4.25 percent of total nonfarm payrolls. Most of those jobs are in offices and bank branches around the country. (The output data given here are drawn from the Bureau of Economic Analysis, GDP by Industry data. The employment data are from the Bureau of Labor Statistics, Payroll Employment data. Author’s calculations.)

Still, salaries and bonuses at the top are extremely attractive, so perhaps the externality plays out by drawing the best and brightest away from other more productive activities. The Harvard Crimson reported that in 2007, 23 percent of graduating Harvard seniors said they planned to enter finance. That is an impressive number, but things turned around sharply, with the 23 percent figure falling to 11.5 percent in 2009 after the financial crisis. At this point, the financial industry really isn’t large enough to crowd out other parts of the economy.

Meanwhile, the insurance industry serves an important social purpose providing life, property, and casualty insurance. AIG got into trouble in the crisis because it strayed into providing very risky financial services, not because of its main insurance business. Likewise, the core value of banks is financial intermediation between savers and investors, giving savers relatively secure and liquid assets while also funding investment.

There are critics of how well our banking industry serves this core purpose, a quality that is hard to determine. My judgment is that it does the job pretty well compared to most other countries. As the IMF reported in September 2015, the non-performing loan problem among European banks remains severe, whereas most U.S. banks now have strong balance sheets. Good financial intermediation means that most of the savings dollars are transferred to investors and are not lost through inefficient bank operations. A 2002 study that I participated in found bank productivity higher in the United States than in France or Germany.

The parts of the financial sector that give rise to the most concern are market-making, deal-making and the creation and trading of derivatives on Wall Street. The volume of market trading has increased exponentially because of the increased speed of computers and communications. Up to a certain point, the increased volume is helpful because it adds to the liquidity of markets, but the advent of high-frequency trading has taken us over the top. As Michael Lewis describes in his book Flash Boys, the high speed traders are finding ways to shave milliseconds off the time needed to make trades. That is thoroughly wasteful. As for deal-making, it has been going on for a long time — indeed the go-go years for deals were in the 1980s — so it is hard to blame the recent slowing of economic growth on this activity.

Still, the explosion of derivatives and other overly-complex instruments was problematic, and it is crystal clear that the mortgage market became too opaque and removed accountability from the system. The layering of complex derivatives on top of lousy mortgages (and other shaky assets) distorted the economy, resulted in the overbuilding of houses, and caused the financial crisis. There are plenty of people at fault besides the bankers, but the smart people on Wall Street were driving the process, and they should have known better. The excessive financialization obscured the reality of loans that depended upon ever-rising home prices and thus were never going to be paid back. There was an externality because the private calculations of potential profit ignored the risks being imposed on society.

Is that still the situation today? No. Things have changed. Banks and other financial institutions that create risks for the whole economy are now required to hold sufficient capital to cover losses even in periods of economic and financial stress, plus a liquidity buffer (they must pass “stress tests” administered by the Federal Reserve). The screws have been turned pretty tight, and the owners of large financial institutions will bear the costs of future failures — not taxpayers. This brings private incentives in line with the public interest, getting rid of the externality that gave us too much financialization in the first place. But to keep the future safe, we’ll have to make sure no one forgets what happened in the last crisis, and ensure that new risks are not created in other, less-regulated parts of the industry.

Editor's note: This piece originally appeared in the Washington Post.

Australia's economic performance has been the standout among advanced economies for several decades. With economic growth at nearly twice the pace of US or Germany over the past decade, a remarkable 25 years without a recession and a large, highly competitive mining sector despite the end of the resources boom, Australia remains a strong economic participant in a region of the world where future global growth is likely to be generated.

But with drivers of growth over the past 25 years unlikely to be the engines of growth in coming decades, now is not a time for complacency. And if there's one lesson from Britain's decision to leave the EU, it's that that disruptive forces are sweeping through the global economy. Australia, with its cohesive politics and economic success, has been able to avoid the worst of these problems, but the dangers are present if the economic challenges are not met.

To start with, the impacts of the reforms of the 1980s and 1990s are fading. The investment boom in mining is over, and the prices for mining and agricultural exports will probably remain subdued with slower growth in China. While Australia's incomes were boosted by the improved terms of trade, this has partially reversed. The housing boom will inevitably eventually slow.

As evidenced by the results of the Brexit referendum, there is a distrust of the political and economic elites that have led the world's biggest economies. Disruptive, rapid changes in technology have not led to broad-based productivity growth. Workers in many countries have been left with stagnant incomes and governments with rising public debt.

Industry policy has a bad name among American economists who see it as a manifestation of "capture" where special interests are able to obtain subsidies from taxpayers or special protections that are not in the national interest. The modern theory of industry policy, however, recognises that a well-designed policy can actually help markets work better, therefore helping an economy like Australia's make the transition to a new growth path when faced with changing economic conditions. Productivity is the key to high growth and rising incomes – and well-designed industry policy can help.

Structure of trade competitiveness

Take, for example, Australia's manufacturing sector. Mostly because of comparative advantage, it is the smallest among all advanced economies relative to the size of its economy. In 2010, Germany had 21.2 per cent of its workforce in manufacturing while Australia's was 8.9 per cent. While it's not surprising that Australia's structure of trade competitiveness differs from Germany's because of its enormous export strength of mining and agriculture, it will benefit by taking advantage of its highly skilled workforce and the potential to develop industries based on this human capital – including advanced manufacturing industries.

One of the traditional strengths of the American economy is the close link that exists between leading universities and businesses – an area Australian policymakers are seeking to improve upon. At MIT and Stanford, professors of engineering, biology, finance or economics finish their lectures and head off to the companies they run or advise. They often enlist graduate or undergraduate students to help them with their commercial projects and these collaborations often result in jobs as well as experience. There is a danger in this model if pure research loses out to business interests, but the interaction between academia and the practical needs of companies can largely improve both research and business profitability. It's worth recalling that even the giants of science in the 18th century were motivated by the need to improve navigation or build new machines or design buildings. Funding for research should support greater industry-university cooperation as highlighted by the Watt Review.

Another important element in Australia's continued economic success is the growth of its service industries. With most jobs in these industries, the performance and productivity of services will be the largest determinant of Australia's living standards. Productivity comparisons between Australia and the United States show that Australian productivity lagged behind the US as recently as the mid-1990s, but there has since been substantial catch-up taking place. Smart regulation that promotes competition and rewards innovation are necessary to bring up the laggards. While there is a continuing debate about the possible end of productivity growth in advanced economies, Australia can still do much to catch up to global best practice.

The winners of this weekend's election will be charged with answering an important question: what is the role of government in a modern economy? How they answer that will determine future prosperity for all Australians.

Martin Baily is a senior fellow at the Brookings Institution in Washington and a former chair of the US President's Council of Economic Advisers. He has been invited by the Australian Ministry of Industry Innovation and Science to report on lessons from the US for policies to enhance economic growth, innovation and competitiveness.

Warwick McKibbin AO, is the director of the Centre for Applied Macroeconomic Analysis in the ANU Crawford School of Public Policy and is a non-resident senior fellow at the Brookings Institution.

Editor's note: this opinion first appeared in Australian Financial Review.

Leaders will head to the G-20 Summit in Los Cabos, Mexico, among renewed serious concern about the world economy. The turmoil that started with the U.S. subprime mortgage crisis has resulted in now almost five years of ongoing instability. The emerging market economies fared much better than the advanced economies and pulled out of the crisis already in 2009, but the slowdown we are now facing in 2012 is again global, demonstrating the interdependence in the world economy. The emerging market economies have stronger underlying trend growth rates, but they remain vulnerable to a downturn in the advanced economies. The center of concern is now squarely on Europe, with a recession threatening most European countries, even those that had reasonably good performances so far. After an encouraging start in 2012, the U.S. economy, while not close to a recession, is also showing signs of a slowdown rather than the hoped for steady acceleration of growth. And the slowdown is spreading across the globe.

At a time like this it would be desirable and necessary that the G-20 show real initiative and cohesion. The essays in this collection look at the challenge from various angles. There is concern that the G-20 is losing its sense of purpose, that cohesion is decreasing rather than increasing, and that policy initiatives are reactive to events rather than proactive. Let us hope that at this moment of great difficulty, the G-20 will succeed in giving the world economy a new sense of direction and confidence. It is much needed.

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For Cubans, “D17”—December 17, 2014—changed everything. On that day, the United States and Cuba announced that the two countries would renew diplomatic relations nearly 60 years after Fidel Castro came to power. For both countries, a new transformation has begun—but this time, it is the promise of Cuba’s insertion in the globalized economy and the crumbling U.S. embargo that is catalyzing change on the island.

On May 31, the Brookings Book Club hosted Nonresident Senior Fellow Richard E. Feinberg and NPR Correspondent Tom Gjelten for a discussion of Feinberg’s new book, “Open for Business: Building the New Cuban Economy” (Brookings Institution Press, 2016). The discussion focused on the factors that guided this monumental decision: international diplomacy; changes already underway in Cuba; successful Cuban entrepreneurs and foreign investments; and scenarios for Cuba’s future development path.

Three young Cuban leaders, including two whose vignettes appear in the book, “Open for Business,” joined the discussion and shared their personal experiences with the economic realities in Cuba today, as well as the opportunities created by the shift in Cuban-American relations.

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• Open for business: Building the new Cuban economy

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• Open for business: Building the new Cuban economy

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• Transcript (.pdf)

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• 20160531_cuba_economy_transcript