Economist: Trump says he wants real growth for America. Can he deliver?

President Trump’s economic team paints a rosier picture of what his policies can accomplish than the economics profession is willing to endorse.

Trump’s team is formulating budget and tax proposals that project 3 percent annual growth, while the number crunchers at the Congressional Budget Office estimate only 1.9 percent.

How fast the economy can grow comes down to the simple sum of likely worker productivity and labor force growth. Since the financial crisis, productivity has advanced about 1 percent a year, compared to 2 percent in prior decades.

Thanks to baby boomer retirements and a declining birth rate, the prime working age population — those aged 25 to 65 — is not likely to grow even 1 percent annually — even with well-conceived, needs-based immigration reforms and changes in entitlement programs that encourage more adults to work.

The premise underlying Trump’s program — lower taxes, health care reform, deregulation, infrastructure spending and tougher trade policies to lower the import deficit — is to make the United States a more attractive location for investment and innovation than, for example, China or Mexico.

There’s no doubt that cutting corporate and personal income taxes and spending more on roads and highways could give the economy a Keynesian jolt and raise growth above 3 percent for a few quarters. But Trump’s policy reforms are likely to be watered down by political infighting.

The prospects that those proposals will carry long-term punch for productivity and growth are limited by congressional politics and, perhaps more fundamentally, by conditions limiting the efficacy of pushing up investment through tax cuts.

As with health care, the GOP in Congress is sharply divided on tax reform. For example, should corporate reform tax imports to make the package revenue neutral, or should we accept a somewhat bigger federal deficit? Also, Trump and Speaker Ryan are unlikely to get much help from Democrats to forge a bipartisan majority.

Similarly, using private money to improve roads and bridges has some potential, but many improvements will likely require unpopular new taxes and user fees. Trump’s promise to get tough on trade faces strong opposition even among skeptics inside his own White House.

More importantly, though, many economists believe low labor productivity growth is baked into the cake. Led by Northwestern University Professor Robert Gordon, most hew to the notion that the faster pace of productivity growth accomplished during the American industrial era — roughly 1870 to 1970 — resulted from groundbreaking innovations like electricity, the interstate highway system and antibiotics. The effects of those innovations are not likely to be repeated.

These days, they say, important new technologies — game machines and handheld devices that permit comparison shopping while roaming the aisles at Target — do more to entertain and enhance our leisure time than boost productivity.

The problem is that economists are really good at explaining what just happened — in this case, the productivity slowdown of the last few decades — but are lousy at telling us much about the future.

Our models look at recent trends, cast them in concrete and then extrapolate into the future. They can’t accurately predict GDP growth two or three quarters from now, never mind tell us much about how emerging innovations will change work and the broader contours of the economy one or several decades into the future.

Breakthroughs in artificial intelligence and robotics — from robots that perform routine tooth repairs for dentists to artificial intelligence programs that accelerate the work of automobile and fashion designers — have the potential to replace up to 90 percent of current job categories, or at least to make workers occupying most positions profoundly more efficient.

In the decades ahead, machines that can feel and think — replacing the tactile advantages of the human hand and genuinely solving tough problems, as opposed to merely accelerating the searching and processing of information — will boost productivity in ways we can hardly fathom.

Vision and imagination have a way of winning out over pessimism and ossified thinking. Perhaps it’s a good thing that the White House has only a thin representation of economists and other experts telling President Trump what can’t be achieved.

Trump’s supporters keep talking about rekindling animal spirits, but perhaps they will fill America’s biggest deficit — the lack of confidence that vexing challenges can be turned to our advantage.