The campaign for the 2016 Presidential nominations has shaken the political kaleidoscope, and the pieces are still moving. The populist surge of both Donald Trump and Bernie Sanders has torn the carefully crafted campaign strategies of other candidates into tatters. Populism is trumping realism. Political nostrums – like how Evangelical Christians or women will vote – are being challenged almost daily. The political establishment looks like the Wizard of Oz, with feeble powers inside giant machines.

There are, then, many losers in 2016. But perhaps the biggest loser of all is public policy. Policy used to matter quite a lot; the very term “policy platform” implied a solid structure, on which candidates would stand. Today, the strength of a candidate’s policy prescriptions and the strength of their political support seem unrelated. Or if there is a relationship, it is an inverse one. Trump provides the most vivid example of the sundering of policy from politics. But the policies of Sanders don’t come close to adding up either. Trump’s ideas are wacky – but Sanders’ are weak.

Trump’s proposals (when clear enough to be assessed) have been judged to be wholly impractical by every expert who is not certifiable. You cannot, in fact, force a sovereign nation to pay for a 2,000-mile, $20-billion wall you are building to keep their people out. You cannot enact a “total and complete shutdown of Muslims entering the U.S.” You cannot impose a 45 percent tariff on Chinese goods. You cannot cut taxes, ignore entitlements and wipe out the national debt. You cannot deport 11 million people. To be clear, I mean “cannot” here in the narrow, policy sense, rather than in legal or moral terms.

But cries of foul from the policy analysts have fallen on deaf ears. Each time Trump makes a ludicrous suggestion, these experts fill the airwaves with their reasoned arguments against it, Trump ignores them, and his poll ratings go up. Every time an establishment expert attacks one of his proposals, his anti-establishment credentials are burnished.

Meanwhile, the uber-wonk of the Republican field, Jeb Bush, became a piece of political marginalia. He produced some thoughtful and sensible policy ideas, on student financing, economic growth, health care, energy, school reform, and so on. Look where that got him.

Trump has grasped an important truth about politics in the digital age. Policy statements do not need to be serious proposals. They are merely ways to signal to the electorate what your instincts are, and what kinds of things you care about. It doesn’t matter if they don’t pass muster in the DC think-tank community. They are essentially a long list of the candidate’s likes and dislikes – politics in primary colors.

At his rallies, Trump announces his plan to build a wall on the southern border of the U.S., and asks: “And who’s gonna pay for it?” Then he holds out the mike to the crowd. They dutifully shout back: “Mexico!” It’s not true, and it can’t be true, but it doesn’t seem to matter. If Trump wins and appoints Ben Carson, the U.S. will have a Secretary for Education who has wondered aloud if Joseph built the pyramids.

Over on the Democrat side, Hillary Clinton, a wonk to match Bush, continues to fight a nervously close battle against a man who seems to design his policies on a blank sheet of paper, never allowing the facts on the ground to dilute the purity of his vision.

To be clear: I’m not saying that Sanders and Trump are equivalent. Trump plays on fear and loathing; Sanders indulges utopian idealism. But like Trump, the main purpose of Sanders’ policies is to signal a broad set of values, rather than chart a realistic way forward. Even the most progressive analysts of health care policy, like my Brookings colleague Henry Aaron, consider the Sanders plan for a single-payer health care system to be a pipe dream. As Aaron writes: “We know that single-payer mechanisms work in some countries. But those systems evolved over decades, based on gradual and incremental change from what existed before. That is the way that public policy is made in democracies.” Indeed. But not the way public policy is being made on the campaign trail.

Likewise, Sanders’ fiscal policies simply do not stack up, even if he can make the economy grow like it’s the ‘60s (the 1860s, that is). But don’t take my word for it: ask ultra-liberal economist Paul Krugman. Or indeed the four Democrat former chairs of the president’s Council of Economic Advisers who jointly wrote to warn of the fuzzy math at the heart of Sanders’ tax and spending plans. Sanders is playing fantasy fiscal policy.

But just as the unhinged ideas from Trump are doing nothing to dampen his fans, so the unrealistic ones from Sanders are not putting off his core supporters. And just as the scorn of the establishment helps Trump, so the attacks from experts on the mainstream left on Sanders’ ideas bolster his image as a revolutionary idealist, refusing to accept the status quo.

We should be honest: it is only in exceptional circumstances that policy is likely to be the central ingredient of politics. The personality, vision and message of the candidate, and the efficiency of a political operation, are typically more important. We should also be honest that the aspirational nature of campaign pledges very often puts them well beyond reasonable reach. Remember Hoover’s “chicken in every pot and a car in every garage?” Presidents can’t make that kind of change happen.

But even if policies declared on the campaign trail have often been a stretch, they have at least been a stretch in the right direction. Even if they were aspirational, they were not bonkers. The capacity to propose sensible policy has historically been a necessary test of political candidates, with scholars and serious journalists acting as examiners. Good policy may not often win you an election, but really bad policy could lose one. Now, in a fragmented media market, this basic test of policy seriousness may no longer disqualify a candidate.

Most successful Presidential candidates have, once in office, attempted to follow through on most (75% according to one study) of their campaign promises. Obama tried for 80%, according to Politifact. But many of those being made this year cannot be taken seriously, even perhaps by the candidates themselves. They are positioning devices, rather than proposals.

For a scholar working in a public policy think-tank, these are of course disheartening trends. What use is there for policy analysis when it seems as if politicians barely need policies at all? But there are deeper dangers here. If policy and politics separate entirely, the people who end up in office are likely to have little regard for policies, or even the skills required to make them. This will reduce the chances that policies will be implemented successfully, or that they will be effective, and therefore make them even less relevant to an electorate already concerned that our governance system is broken. Worse, the careless disregard for facts, laws, costs, and even basic math is corrosive to the democratic process. It is too much, perhaps, to expect politicians to seek to make voters better informed about the key issues. But I think it is reasonable to hope they will not misinform them.

I hope that I am wrong. I hope that policy will make a political comeback. But I’m not holding my breath.

Editor's note: This piece originally appeared in Bloomberg Government.

Summary

At the Gleneagles Summit in 2005, leaders of the G8 group of nations committed to increase aid to poor nations by $50 billion per year. During the same year, in a meeting in Paris, donors promised to coordinate their interventions for more effective delivery. These commitments are now often referred to as the promise of donors to “scale up aid.” Increasing aid flows and improving coordination are indeed important goals and, in fact, goals that donors seem to have trouble meeting. The international donor community met this fall in Accra and will meet in Doha in November 2008 to review progress with this aspect of scaling up aid, and it is hoped that they will recommit to meet the ambitious targets set three years ago.

Scaling up aid is only one of the challenges that donors face. A more important challenge is to “scale up through aid,” meaning that aid flows should not merely support short-lived, one-time and partial development interventions—pilot projects, short-term technical assistance, programs that only address part of the problem, but leave major bottlenecks unaddressed—but should support projects, programs and policies that scale up successful interventions in a country, region or globally to reach the entire target population. Scaling up means that programs are long-term and sustained and that external support is aligned with country needs and deals comprehensively with the development challenges—often by working in partnership with other donors and pooling resources. This is the scaling up challenge that donors should address head-on, but so far have not.

This policy brief reports on the findings of an in-depth review of the literature and practice of scaling up development interventions and focuses on the role that aid donors can play in supporting scaling up for effective development. It stresses that successful scaling up with external assistance means that donor agencies need to: work with a vision and leadership; help create the political constituencies for large-scale implementation; create linkages among project, program and policy interventions; strengthen the institutional capacity of the implementing entities; provide for effective incentives and accountabilities of their own staff and management; work together with each other; monitor and evaluate the progress of programs with special attention to the scaling up dimension; and finally make sure they focus on effective preparation and flexible implementation of the scaling up process. While this is a long-term agenda, donors can take a few practical steps right away that will provide a basis for a more ambitious effort over time.

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For more than a decade, the economy’s rate of productivity growth has been dismal, which is bad news for workers since their incomes rise slowly or not at all when this is the case. Economists have struggled to understand why American productivity has been so weak. After all, with all the information technology innovations that make our lives easier like iPhones, Google, and Uber, why hasn’t our country been able to work more productively, giving us either more leisure time, or allowed us to get more done at work and paid more in return?

One answer often given is that the government statisticians must be measuring something wrong – notably, the benefits of Google and all the free stuff we can now access on our phones, tablets and computers. Perhaps government statisticians just couldn’t figure out how to include those new services in a meaningful way into the data?

A new research paper by Fed economists throws cold water on that idea. They think that free stuff like Facebook should not be counted in GDP, or in measures of productivity, because consumers do not pay for these services directly; the costs of providing them are paid for by advertisers. The authors point out that free services paid for by advertising are not new; for example, when television broadcasting was introduced it was provided free to households and much of it still is.

The Fed economists argue that free services like Google are a form of “consumer surplus,” defined as the value consumers place on the things they buy that is over and above the price they have paid. Consumer surplus has never been included in past measures of GDP or productivity, they point out. Economist Robert Gordon, who commented on the Fed paper at the conference where it was presented, argued that even if consumer surplus were to be counted, most of the free stuff such as search engines, e-commerce, airport check-in kiosks and the like was already available by 2004, and hence would not explain the productivity growth slowdown that occurred around that time.

The Fed economists also point out that the slowdown in productivity growth is a very big deal. If the rate of growth achieved from 1995 to 2004 had continued for another decade, GDP would have been $3 trillion higher, the authors calculate. And the United States is not alone in facing weak productivity; it is a problem for all developed economies. It is hard to believe that such a large problem faced by so many countries could be explained by errors in the way GDP and productivity are measured.

Even though I agree with the Fed authors that the growth slowdown is real, there are potentially serious measurement problems for the economy that predate the 2004 slowdown.

Health care is the most important example. It amounts to around 19% of GDP and in the official accounts there has been no productivity growth at all in this sector over many, many years. In part that may reflect inefficiencies in health care delivery, but no one can doubt that the quality of care has increased. New diagnostic and scanning technologies, new surgical procedures, and new drugs have transformed how patients are treated and yet none of these advances has been counted in measured productivity data. The pace of medical progress probably was just as fast in the past as it is now, so this measurement problem does not explain the slowdown. Nevertheless, trying to obtain better measures of health care productivity is an urgent task. The fault is not with the government’s statisticians, who do a tremendous job with very limited resources. The fault lies with those in Congress who undervalue good economic statistics.

Gordon, in his influential new book The Rise and Fall of American Growth, argues that the American engine of innovation has largely run its course. The big and important innovations are behind us and future productivity growth will be slow. My own view is that the digital revolution has not nearly reached an end, and advances in materials science and biotechnology promise important innovations to come. Productivity growth seems to go in waves and is impossible to forecast, so it is hard to say for sure if Gordon is wrong, but I think he is.

Fortune reported in June 2015 that 70% of its top 500 CEOs listed rapid technological change as their biggest challenge. I am confident that companies will figure out the technology challenge, and productivity growth will get back on track, hopefully sooner rather than later.

Editor’s note: This piece originally appeared in Fortune.