The Davis-Bacon Standoff: Do Prevailing Wage Rules Inflate Infrastructure Costs?

As the federal government continues executing major infrastructure appropriations under expanded public works legislation, few labor policies draw as much scrutiny from fiscal conservatives and business associations as the Davis-Bacon Act of 1931 ^{[1], [2]}. Enacted during the Great Depression to prevent out-of-state contractors from underbidding local construction wages on federal projects, the statute requires contractors and subcontractors on federally funded construction projects exceeding $2,000 to pay their laborers and mechanics no less than the locally "prevailing" wage and fringe benefits ^[2].

Critics of the law, including conservative commentators, free-market think tanks, and trade groups like the Associated Builders and Contractors (ABC), contend that Davis-Bacon acts as an artificial price floor ^{[3], [4]}. They argue that the Department of Labor’s Wage and Hour Division (WHD) sets prevailing rates based on flawed surveys that overweight union collective bargaining agreements, inflating federal contract labor costs by 10% to 25% and deterring non-union contractors—who represent roughly 88% of the U.S. construction workforce—from bidding on public works ^{[3], [4]}.

Conversely, building trade unions and labor economists contend that prevailing wage regulations ensure high quality, prevent a "race to the bottom" in skilled craft wages, and protect public investments ^[5]. They point to peer-reviewed econometric studies demonstrating that higher hourly pay attracts more experienced craftworkers, increases apprenticeship completion rates, and reduces workplace injuries, allowing projects to be completed with fewer overall labor hours ^[5].

What the Data Shows: CBO Estimates and Wage Differentials

To evaluate the fiscal footprint of prevailing wage mandates, economists begin with the Congressional Budget Office (CBO) baseline analyses ^[1]. In its periodic deficit-reduction option reviews, the CBO calculates that repealing the Davis-Bacon Act would reduce federal outlays by $17.8 billion over a ten-year budget window ^[1]. The CBO notes that these savings stem primarily from lower direct wage payments on federal contracts and reduced administrative compliance costs for federal agencies and contractors ^[1].

A primary driver of these estimated savings is the systematic gap between Department of Labor (DOL) "prevailing" wage determinations and broader market median wages reported by the Bureau of Labor Statistics (BLS) ^{[2], [4]}. Under the historic 1983 rule, the DOL required a single wage rate to be paid to more than 50% of workers in a locality to establish a prevailing union rate; otherwise, it calculated a weighted average of all reported wages ^[2]. In August 2023, the Department of Labor published a major regulatory overhaul reinstating the "30 percent rule" ^[2]. Under this three-tiered methodology:

• Majority Rule (Tier 1): If over 50% of workers in a trade classification in a county receive the exact same rate, that rate becomes the prevailing wage ^[2].
• 30 Percent Rule (Tier 2): If no single rate achieves a 50% majority, the rate paid to the greatest number of workers—provided it reaches at least 30% of workers—becomes the prevailing wage ^[2].
• Weighted Average (Tier 3): If no rate reaches 30%, the prevailing wage defaults to a weighted average of all reported worker wages in that county ^[2].

Because union collective bargaining agreements feature uniform wage scales across entire metropolitan areas, union rates frequently capture the 30% or 50% threshold in county surveys, even in regions where union membership represents a minority of the workforce ^{[3], [4]}. Comparative analyses by the Beacon Hill Institute and the Government Accountability Office (GAO) have found that DOL prevailing wages exceed BLS Occupational Employment Statistics (OES) median wages by an average of 9.9% to 22% across major trade categories ^{[4], [6]}.

The Full Picture: Productivity, Turnover, and Total Project Costs

While wage differential models assume that a 15% increase in hourly wages leads to a proportional increase in building costs, empirical labor economics research presents a more nuanced reality ^[5]. Economists such as Dr. Kevin Duncan (Colorado State University) and researchers analyzing state-level prevailing wage repeals note that labor costs account for only 20% to 25% of total public construction expenditures, with materials, heavy machinery, architectural design, permitting, and land acquisition comprising the remaining 75% to 80% ^[5].

Consequently, even a 20% premium on direct site labor translates into a theoretical total project cost increase of only 4% to 5% before accounting for productivity adjustments ^[5]. Statistical studies of actual bid prices and completion costs for highway construction, public school facilities, and municipal buildings across states with and without prevailing wage laws reveal several offsetting mechanisms:

1. Skilled Labor Productivity: Higher hourly compensation attracts highly skilled journey-level craftworkers who complete tasks faster and with lower rates of structural defect or rework ^[5].
2. Apprenticeship and Safety: Contractors operating under prevailing wage structures invest significantly more in registered apprenticeship programs. Studies show prevailing wage states experience 14% to 19% lower construction workplace injury rates, reducing workers' compensation premiums and project downtime ^[5].
3. Capital Substitution: Faced with higher labor floors, contractors tend to deploy more advanced equipment, pre-fabricated materials, and automated machinery, reducing total labor hours required on site ^[5].

"Focusing strictly on hourly wage rates misses the fundamental equation of construction economics: total cost equals wage rate divided by productivity. When higher wages attract skilled labor that completes projects faster with less capital waste, the net cost to taxpayers often remains unchanged."

Furthermore, administrative surveys by the GAO have highlighted legitimate operational drawbacks of the Davis-Bacon framework ^[6]. Small non-union contractors frequently cite the weekly certified payroll reporting requirements under the Copeland Anti-Kickback Act as a primary barrier to entry ^{[4], [6]}. Small firms without dedicated legal or compliance departments face compliance costs estimated at 1% to 3% of contract value, which can reduce the pool of competitive bidders on smaller municipal projects ^[4].

Conclusion: Fact-Based Policy Choices

The debate over the Davis-Bacon Act reflects fundamentally distinct economic priorities rather than a simple mathematical error ^{[1], [5]}. From a strict federal budgetary perspective, repealing or reforming Davis-Bacon would yield estimated direct savings of $17.8 billion over a decade and ease administrative reporting burdens for non-union contractors ^{[1], [4]}.

However, claims that the law inflates total infrastructure build costs by 25% are unproven by empirical project-level data ^[5]. Higher wage floors are largely absorbed through productivity gains, improved workforce retention, and capital efficiency ^[5]. Policymakers evaluating federal public works rules must weigh the direct budgetary savings of wage deregulation against the broader societal benefits of maintaining competitive compensation, apprenticeship pipelines, and workplace safety standards across the national construction sector.