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Market Power In Neoclassical Growth Models

Greg Mankiw Working Paper

Date Posted:: June 27, 2022
Is Database:: Database

Dynamic efficiency findings challenge debt policy metrics: US social capital returns >8% show market vitality. Firm market power invalidates real rates as government debt welfare indicator.

In neoclassical growth models, incorporating firm market power reveals that real interest rates are a poor indicator of welfare effects from increased government debt. When firms have market power, the real interest rate is about 4 percentage points below the net marginal product of capital, suggesting a social return on capital exceeding 8%. This indicates dynamic efficiency in the U.S. economy. However, government debt can crowd out capital, reducing aggregate consumption if the net marginal product of capital surpasses the growth rate. The presence of market power complicates the welfare analysis, as the aggregate and generational effects of debt may conflict, unlike in competitive markets. This underscores the inadequacy of using real interest rates alone to assess welfare impacts of government indebtedness.

This paper has addressed a classic topic: the optimal accumulation of capital and the welfare effects of government debt in neoclassical growth models. Over the past several decades, the thinking of many economists has been shaped by the Solow growth model and the Diamond overlapping-generations model, which assume certainty and competitive markets. In these models, the real interest rate reflects the marginal product of capital. As a result, the low real interest rates experienced in recent years have tempted some economists to conclude that capital accumulation now has only small social value at the margin and, therefore, that the crowding out of capital by government debt is of little concern. The innovation in this paper is to generalize these two canonical modelsto include firms with market power. In this environment, the real interest rate earned by savers is below the net marginal product of capital. For a plausible calibration of the extended Solow model, the wedge between them is about 4 percentage points. The calibration also suggests that the U.S. economy is dynamically efficient. When market power is introduced into the Diamond model, government Ponzi schemes can have different implications for welfare than they do under competition. Even if a perpetual rollover of government debt and accumulating interest is feasible, the crowding out of capital may still reduce steady-state welfare.Previous work has established a close connection between the feasibility of government Ponzi schemes and the possibility of rational speculative bubbles. This equivalence suggests that in an overlapping-generations model with market power, rational bubbles are possible whenever government Ponzi schemes are. But unlike under competition, these bubbles may reduce welfare because they could occur even in dynamically efficient economies. By diverting saving away from capital accumulation, bubbles may depress aggregate consumption. This topic could be addressed in future research. Much previous work on dynamic efficiency and Ponzi schemes has stressed the role of uncertainty about capital returns. Under uncertainty, the risk-free real interest rate is below the expected marginal product of capital, and attempted Ponzi schemes by the government are riskyThis paper abstracts from these issues by considering models with certainty. A more realistic analysis of the U.S. economy would include both uncertainty and market power. We also leave that topic for future work.

Laurence Ball and Greg Mankiw, "Market Power In Neoclassical Growth Models,"Working Paper, April 2022, http://www.restud.com/wp-content/uploads/2022/05/MS30597manuscript.pdf

Impact of firm market power"...If typical prices are marked up 20% over marginal cost, as some of the literature suggests, the real interest rate is about 4 percentage points below the social return on capital. Correcting for the effects of market power yields an estimate of the social return of more than 8%. Because this estimated social return on capital is much higher than the economy’s growth rate, it indicates that the U.S. economy is dynamically efficient...."
Relationship with "Government Ponzi Scheme""...The impact of a government Ponzi scheme on welfare depends on two effects. The first we call the aggregate effect. Because government debt crowds out capital, it depresses aggregate consumption if the net marginal product of capital exceeds the growth rate and increases aggregate consumption in the opposite case. (This is parallel to the classic Phelps, 1961, result.) The second we call the generational effect: the introduction of government debt improves the allocation of aggregate consumption between the young and the old. This effect is similar to the Pareto improvement that can result from pay-as-you-go social security when the growth rate exceeds the interest rate (Samuelson, 1958; Weil, 2008). In a competitive economy, the aggregate and generational effects of debt work in the same direction. In an economy with market power, when the economy’s growth rate is greater than the real interest rate but less than the net marginal product of capital, the two effects conflict. These findings show that, in the presence of market power, the real interest rate by itself is a poor guide for judging the welfare effect of increased government indebtedness..."

The Fairest Way to Reform Social Security May Also Be the Worst Way to Grow the Economy

Andrew Biggs American Enterprise Institute

Date Posted:: May 28, 2026
Is Database:: Database
Is Important:: Important

Biggs argues that “fair” approaches to restoring Social Security solvency – those that do not cut already accrued benefits – are less effective than “unfair” ones that do, because the latter incentivize increased work effort, raising growth and revenue.

Imagine that Social Security reform follows the fairness model, in which accrued benefits are paid in full but the rate at which future benefits are earned is reduced. A simple way to do this is to increase the payroll tax rate To keep Social Security permanently solvent, meaning through 75 years and beyond, would require an immediate and permanent increase in the payroll tax rate [from] 12.4% to 17.6%. The higher rate would decrease labor supply and reduce economic growth. [Consider] an alternate reform, which looks clearly unfair: fix Social Security’s funding gap entirely by reducing accrued benefits that Americans already have earned. As of 2025, Americans had accrued $54 trillion in Social Security benefits. Social Security’s unfunded obligation as of 2025 was $26 trillion. So, roughly, this means cutting Americans’ “earned benefits” in half. [Analyzing the 1977 reform that undid the notorious 1972 “double-indexing” of benefits, a group of economists], using SSA earnings data, found that, for every dollar of lost benefits, the affected Americans increased their earnings by 61 cents. Moreover, these additional earnings would be taxed by Social Security, further strengthening the program’s finances. In effect, this makes cutting benefits a “cheaper” way to fix Social Security than raising taxes, because people respond in ways that also increase tax revenues.

Takeaways by Macro Roundup^® AI

A 5.2 pts payroll tax increase to 17.6% drives reduced labor supply and slower economic growth vs. the status quo.
$54 trillion in accrued Social Security benefits vs. the unfunded obligation reveals that benefit cuts would reduce growth drag but.

The World’s Most Surprising Capitalist Makeover Is Under Way in Sweden

Tom Fairless Wall Street Journal

Date Posted:: May 12, 2026
Is Database:: Database

Swedish public social spending is now 23.7% of GDP, just 1pp above that of the US and well under France’s 31.6%. Market-based reforms in the 1990s brought overall government spending down from 69.4% to 49.3% in 2024.

For decades, Sweden was shorthand for the brand of high-tax, high-spend government that managed people’s lives from cradle to grave through state-run hospitals, schools and care homes. No longer. With little fanfare, this Nordic country of 11 million has embraced capitalism. Today, nearly half of primary healthcare clinics are privately owned, many by private-equity firms. One in three public high schools is privately run, up from 20% in 2011. School operators are listed on the stock exchange. The capitalist makeover has allowed Sweden to do what few industrialized countries have managed in recent years: shrink the size of the state. That has enabled the government to sharply lower taxes and, economists say, sparked a surge in entrepreneurship and economic growth. Its total public social spending bill—which includes healthcare, education and all welfare payments—has fallen to 24% of gross domestic product, similar to the U.S. and well below the over 30% for nations like France and Italy. Sweden’s economy is expected to grow by around 2% a year through 2030, roughly the same pace as the U.S. and double the growth rates of France and Germany, according to an April forecast by the International Monetary Fund.

Takeaways by Macro Roundup^® AI

Sweden’s public social spending fell to 24% of GDP, matching the U.S. and 6+ pts below France/Italy, driving lower taxes.
Privately-run primary healthcare clinics reached nearly 50% of the market vs. 20% for high schools in 2011, demonstrating accelerating privatization.
Sweden’s projected 2% annual GDP growth through 2030 doubles France and Germany’s rates, resulting from state downsizing and capitalist sector.

How Policy and Demographics Are Reshaping SNAP: From Families with Children to Older Adults

Angela Rachidi American Enterprise Institute

Date Posted:: May 1, 2026
Is Database:: Database

About 40mm Americans, 12% of the population, receive SNAP benefits, up from 6% in 2000. In 2023, only 34% of these households included children, down from 49% in 2010, while 36% contained an elderly person, up from 16% in FY2010.

Comparing FY2000 with FY2025, the share of the population receiving SNAP doubled from 6% to 12%, while real SNAP costs per capita increased by 179%—from roughly $100 per year to $279 (in 2024 dollars). Despite this growth, per capita participation and costs in FY2025 remained below their pre-pandemic peak in 2013, which coincided with the aftermath of the Great Recession and changes in eligibility and other policies stemming from the 2008 Farm Bill. SNAP is countercyclical, meaning that all else equal, the number of people receiving SNAP should rise during recessions because of increased unemployment and decline as the economy recovers, [though] overall SNAP participation has grown faster than changes in the unemployment rate alone would predict. Over the long run, and especially since FY2020 (due to the Thrifty Food Plan’s increase in the maximum SNAP benefit), costs per capita have not returned to prerecession levels after a period of high unemployment. In FY2023, the share of SNAP households containing an elderly person (36%) exceeded the share containing a child (34%) for the first time. This was a sharp departure from the early 2000s, when more than half of SNAP households contained a child and less than 20% included an elderly person (Figure 2).

Takeaways by Macro Roundup^® AI

SNAP participation doubled from 6% to 12% of the population between FY2000–FY2025, driven by policy expansions and demographic shifts outpacing.
Real per capita SNAP costs rose 179% from $100 to $279 (2024 dollars) over 25 years, with the Thrifty Food.
FY2025 SNAP enrollment remains 8–12% below the FY2013 peak despite 25-year growth, indicating countercyclical policy design successfully targets recession-driven need.

Washington’s Growing Portfolio: Tracking U.S. Government Investments

Jonathan Hillman Council On Foreign Relations

Date Posted:: April 23, 2026
Is Database:: Database

Since January 2025, the USG has taken equity stakes totaling $20.9B in 16 American businesses. $8.6B, ~41% of the total, was invested in critical mineral miners and processors, while $8.9B, ~43% of the total, funded the government’s 10% stake in Intel.

Since January 2025, the U.S. government has invested $20.9 billion across sixteen deals involving direct ownership, broadening a toolkit that has traditionally focused on grants, loans, and tax incentives. The Department of Commerce has participated in six such deals, including taking a 10% stake in Intel. The Development Finance Corporation, the United States’ development bank, has executed three equity transactions in critical minerals, healthcare, and infrastructure. The Department of Defense leads the way with seven such deals. The U.S. government is also working with a range of partners and has mobilized an additional $4.75 billion in investment. Private co-investors include J.P. Morgan, Goldman Sachs, and others.

Takeaways by Macro Roundup^® AI

The U.S. government deployed $20.9bn in direct equity investments since January 2025, expanding beyond traditional grants and loans to drive.
The Department of Defense leads with seven equity deals of the sixteen total, establishing direct ownership as a core national.
Commerce Department’s 10% Intel stake exemplifies government equity participation in critical infrastructure, mobilizing private capital alongside public investment to strengthen.

How Federal Spending is Distributed by Age

Kent Smetters University of Pennsylvania

Date Posted:: April 2, 2026
Is Database:: Database
Is Important:: Important

In 2025, of the 62.5% of Federal spending that is age-assignable on a per-capita basis, US retirees aged 65+ were given $43,700, working-age adults 26–64 got $7,300, and children and young adults got $4,300.

We trace spending items within 52 general spending categories, totalling $7T for the 2025 Fiscal Year. We are able to classify a total of $4.4T across three broad age categories and assign the remaining $2.6T to an all-ages residual. Retirees (adults age 65 and older) receive $2.7T, equal to 38.6% of total federal outlays and 61.9% of age-assignable spending. Working-age adults (ages 26-64) receive $1.2T (27.9% of age-assignable), and children and young adults (under age 26) receive $449B (10.3%). The dominance of the retiree category reflects two programs above all others: Social Security and Medicare. Social Security directs $1.3T to retirees, and Medicare sends $835B. Together, they account for 80% of all age-assignable spending on older adults. But the retiree total extends beyond these two entitlements. Federal employee retirement benefits ($169B), housing assistance for older households, Medicaid long-term-care spending, and VA medical care all contribute, making the federal budget more retiree-focused than a Social Security–only lens would suggest.

Takeaways by Macro Roundup^® AI

Federal spending heavily favors retirees, who receive 38.6 percent of total outlays through Social Security, Medicare, and related programs.
Working-age adults and children combined receive less than half the spending directed to retirees despite representing larger population segments.
Social Security and Medicare alone account for 80 percent of all federal spending on older Americans, dominating the retiree budget.

Has the United States Bent the Health Care Cost Curve?

David Cutler and Lev Klarnet Brookings Papers On Economic Activity

Date Posted:: March 30, 2026
Is Database:: Database
Is Important:: Important

In 2024, medical spending as a share of GDP was just above its 2010 level and 15% ($977B) below its 2010 forecast; 21% of the gap was due to technology, 24% to price reductions, and 11–27% to reforms such as prior authorization and higher deductibles.

Five factors are important in the slowdown in spending [Figure 16]. The first is technology-associated changes in health and site of care. These correspond to the subsequent innovations in our model. Together, technologies along these lines account for 21% of the overall cost slowdown and double that in Medicare. Second, long-run supply is more elastic than short-run supply, which lowers spending over time. This is particularly apparent in the impact of patent expiration for pharmaceuticals and in relative declines in imaging reimbursement. We estimate that greater long-run supply explains 6% of the spending slowdown. Third, a variety of market changes contribute to reduced and more elastic demand, including increased cost sharing paid by consumers, physicians not paid as much for using technologies, and insurers imposing restrictions on technology use - a rough guess is that these account for 11 to 27% of the spending slowdown. Fourth, the population is healthier in ways that reduce spending. This includes fewer hospitalizations for smoking-related conditions and reduced need for formal home health care. The birth rate has fallen as well, which reduces the need for care. We estimate improved population health explains 7% of the spending slowdown. A major component is slower price growth. Net of upcoding, we estimate lower price growth explains 24% of the spending slowdown.

Dynamic efficiency findings challenge debt policy metrics: US social capital returns >8% show market vitality. Firm market power invalidates real rates as government debt welfare indicator.

Biggs argues that “fair” approaches to restoring Social Security solvency – those that do not cut already accrued benefits – are less effective than “unfair” ones that do, because the latter incentivize increased work effort, raising growth and revenue.

Does preserving Social Security benefits require sacrificing economic growth?

Takeaways by Macro Roundup® AI

Related Articles:

Swedish public social spending is now 23.7% of GDP, just 1pp above that of the US and well under France’s 31.6%. Market-based reforms in the 1990s brought overall government spending down from 69.4% to 49.3% in 2024.

How is Sweden's shift to privatization impacting its economic growth?

Takeaways by Macro Roundup® AI

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About 40mm Americans, 12% of the population, receive SNAP benefits, up from 6% in 2000. In 2023, only 34% of these households included children, down from 49% in 2010, while 36% contained an elderly person, up from 16% in FY2010.

How Are Policy Changes and Demographic Shifts Impacting SNAP Enrollment?

Takeaways by Macro Roundup® AI

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Since January 2025, the USG has taken equity stakes totaling $20.9B in 16 American businesses. $8.6B, ~41% of the total, was invested in critical mineral miners and processors, while $8.9B, ~43% of the total, funded the government’s 10% stake in Intel.

Takeaways by Macro Roundup® AI

Related Articles:

In 2025, of the 62.5% of Federal spending that is age-assignable on a per-capita basis, US retirees aged 65+ were given $43,700, working-age adults 26–64 got $7,300, and children and young adults got $4,300.

Takeaways by Macro Roundup® AI

Related Articles:

In 2024, medical spending as a share of GDP was just above its 2010 level and 15% ($977B) below its 2010 forecast; 21% of the gap was due to technology, 24% to price reductions, and 11–27% to reforms such as prior authorization and higher deductibles.

Related Articles:

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