Simon Johnson, former chief economist of the International Monetary Fund, is the Ronald A. Kurtz Professor of Entrepreneurship at the M.I.T. Sloan School of Management and co-author of “White House Burning: The Founding Fathers, Our National Debt, and Why It Matters to You.”

After many months of rival assertions by interested parties, we finally have an authoritative assessment by an impartial referee of the effects of the so-called Gang of Eight senators’ proposed legislation on immigration. On Tuesday, based on work with the Joint Committee on Taxation, the Congressional Budget Office released two reports – one on the direct federal budget impact and one on the broader and longer-run economic effects, with a helpful summary blog post by the office’s director, Douglas Elmendorf).

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Perspectives from expert contributors.

The assessment is positive. This precise immigration proposal would improve the budget picture (see this helpful chart) and stimulate economic growth. The immediate effects are good and the more lasting effects even better. If anything, the long-run positive effects are likely to be even larger than the C.B.O. is willing to predict, in my assessment. (I’m a member of the office’s Panel of Economic Advisers but I was not involved in any way in this work.)

The debate over immigration is emotionally charged and, judging from recent blog posts, the Heritage Foundation in particular seems primed to dispute every detail in the C.B.O. approach – and to assert that it is underestimating some costs (including what happens when illegal immigrants receive an amnesty and subsequently claim government-provided benefits, a point Heritage has emphasized in its own report).

There is good reason for the C.B.O.’s careful wording in its analysis; it operates within narrow guidelines set by Congress, and its staff is wise to stick to very well-documented points. Still, as the legislation gains potential traction, it is worth keeping in mind why there could be an even larger upside for the American economy.

In 1776, the population of the United States was around 2.5 million; it is now more than 316 million (you can check the real-time Census Bureau population clock, but of course that is only an estimate).

Think about this: What if the original inhabitants had not allowed immigration or imposed very tight restrictions – for example, insisting that immigrants already have a great deal of education? It’s hard to imagine that the United States would have risen as an economy and as a country. How many United States citizens reading this column would be here today? (I’m proud to be an immigrant and a United States citizen.)

The long-term strength of the United States economy lies in its ability to create jobs. For more than 200 years as a republic (and 400 years in total) immigrants have not crowded together on a fixed amount of existing resources – land (in the early days) or factories (from the early 1800s) or the service sector (where most modern jobs arise). Rather the availability of resources essential for labor productivity has increased sharply. Land is improved, infrastructure is built and companies develop.

Most economic analysis about immigration looks at wages and asks whether natives win or lose when more immigrants show up in particular place or with certain skills. At the low end of wage distribution, there is reason to fear adverse consequences for particular groups because of increased competition for jobs. In fact, the C.B.O. does find that income per capita would decline slightly over the next 10 years before increasing in the subsequent 10 years: “Relative to what would occur under current law, S. 744 would lower per capita G.N.P. by 0.7 percent in 2023 and raise it by 0.2 percent in 2033, according to C.B.O.’s central estimates.”

And it is reasonable to ask who will pay how much into our tax system – and who will receive what kind of benefits. This is the terrain that the C.B.O. and the Heritage Foundation are contesting. (See, too, a letter to Senator Marco Rubio, Republican of Florida, from Stephen Gross, the chief actuary of the Social Security Administration. Mr. Gross said immigration reform would be a net positive; of the current 11.5 illegal immigrants, “many of these individuals already work in the country in the underground economy, not paying taxes, and will begin paying taxes” if the immigration legislation are adopted. New illegal immigration would decline but not be eliminated.)

But the longer-run picture is most obviously quite different. The process of creating businesses and investing – what economists like to call capital formation – is much more dynamic than allowed for in many economic models.

People will save and they will invest. Companies will be created. The crucial question is who will have the ideas that shape the 21st century. (See, for example, the work of Charles I. Jones of Stanford University on this point and a paper he and Paul Romer wrote for a broader audience.)

This is partly about education – and the proposed legislation would tilt new visas more toward skilled workers, particularly those in science, technology, engineering, and math (often referred to as STEM).

But it would be a mistake to limited those admitted – or those allowed legal status and eventual citizenship – to people who already have or are in the process of getting a university-level education. To be clear, under the new system there may well be more low-wage immigrants than high-wage immigrants, but the transition to a point system for allocating green cards is designed to increase the share of people with more education and more scientific education, relative to the situation today and relative to what would otherwise occur.

Many people have good ideas. The Internet has opened up the process of innovation. I don’t know anyone who can predict where the next big technologies will come from. I also don’t know who will figure out how to organize production – including the provision of services – in a more effective manner.

We are competing in a world economy based on human capital, and people’s skills and abilities are the basis for our productivity. What we need more than anything, from an economic point of view, is more people (of any age or background) who want to acquire and apply new skills.

Increasing the size of our domestic market over the last 400 years has served us well. Allowing in immigrants in a fiscally responsible manner makes a great deal of sense — and the reports from the Joint Committee on Taxation and C.B.O. are very clear that this is now what is on the table. If the children of immigrants want to get more education, we should welcome the opportunity that this presents. When you cut off the path to higher education, you are depriving people of opportunity – and you are also hurting the economy.

The deeper political irony, of course, is that if the Heritage Foundation and its allies succeed in defeating immigration legislation, there are strong indications that this will hurt the Republican Party at the polls over the next decade and beyond. Yet, even so, House Republicans seem inclined to oppose immigration reform. That would be a mistake on both economic and political grounds.

We are 316 million people in a world of more than 7 billion – on its way to 10 billion or more (read this United Nations report if you like to worry about the future).

We should reform immigration along the lines currently suggested and increase the supply of skilled labor in the world. This will both improve our economy and, at least potentially, help ensure the world stays more prosperous and more stable.

Article source: http://economix.blogs.nytimes.com/2013/06/20/how-immigration-reform-would-help-the-economy/?partner=rss&emc=rss