These briefs distill seven research papers into plain-language summaries for two audiences: Congressional staffers working on acquisition reform legislation and federal contracting officers making source selection decisions every day. Each brief covers what we found, what it means for policy, and what practitioners should do differently. For full methodology and citations, see the Research Papers page.
The Source Selection Evidence Gap: A Scoping Review and Research Agenda
The Question: How strong is the research evidence behind the policy debate over lowest-price (LPTA) versus best-value procurement?
Key Finding: A systematic review of 87 academic and policy works found that only one peer-reviewed study (Landale et al., 2017; N=124) has ever directly compared LPTA and best-value tradeoff outcomes using U.S. federal contract data. The remaining literature consists of theoretical models, small-sample theses, and practitioner commentary. Federal procurement policy affecting hundreds of billions of dollars annually rests on an evidence base that would be considered inadequate in any adjacent policy domain.
What It Means for Policy: Congress has passed multiple LPTA restrictions (NDAA FY2017-FY2019) based on anecdotal evidence and stakeholder testimony rather than rigorous outcome data. OFPP and OMB should fund large-scale empirical studies before enacting further evaluation method mandates. The recently published Omari et al. (2025) FPDS dataset makes such research feasible for the first time.
What It Means for Practitioners: Contracting officers often receive guidance framing LPTA as inherently inferior. The evidence does not support that blanket conclusion. Until better data exist, practitioners should base source selection decisions on the specific characteristics of each procurement rather than on categorical assumptions about method superiority.
Caveats: Scoping reviews map the breadth of a literature rather than assessing effect sizes. The absence of evidence is not evidence of absence – LPTA may well produce worse outcomes, but the data to confirm or refute that claim do not yet exist in the published literature.
Full Paper: Research Papers
The Policy Shock That Didn't Shock: Evaluating Congressional LPTA Restrictions on Federal Procurement Outcomes
The Question: Did Congress’s 2017 restrictions on LPTA source selection (NDAA Section 813) actually improve Department of Defense contract outcomes?
Key Finding: Analyzing 654,307 contracts from FY2017-2023, the study finds that DoD contracts showed a 13- to 21-percentage-point reduction in cost growth relative to civilian agency contracts after Section 813. However, the policy did not work through its intended mechanism: DoD’s LPTA usage rate (39.8%) remained virtually identical to civilian agencies (38.8%) after implementation. The law restricted LPTA use, but contracting officers did not measurably change their source selection behavior.
What It Means for Policy: Legislative mandates with “maximum extent practicable” escape clauses may be less effective than anticipated. Congress should consider whether future acquisition reform requires stronger compliance mechanisms – such as mandatory reporting or affirmative justification requirements – rather than aspirational standards that contracting officers can satisfy without changing behavior.
What It Means for Practitioners: The cost growth improvements observed after Section 813 likely reflect broader DoD acquisition reform efforts rather than source selection shifts alone. Agencies should focus on workforce training and acquisition planning as levers for better outcomes, not just evaluation method selection.
Caveats: FPDS source selection data prior to FY2020 are unreliable, so we cannot observe whether DoD reduced LPTA from a higher pre-treatment baseline. The five robustness corrections reduce the effect from 30 to 13-21 percentage points, reflecting pre-existing convergence trends.
Full Paper: Research Papers
Transaction Costs as Moderators of Procurement Design: When Does Source Selection Method Matter?
The Question: Does evaluation method matter equally for all contracts, or does it matter more for certain types of purchases?
Key Finding: Source selection method matters most when transactions are complex. The policy effect on cost growth is amplified for small contracts (where switching costs are proportionally higher), concentrated in professional and scientific services (where the work is hardest to specify in advance), and larger for cost-reimbursement contracts (where the government bears performance risk). In competitive markets with more than three bidders, the effect is also stronger. These patterns match predictions from transaction cost economics.
What It Means for Policy: A one-size-fits-all mandate on evaluation method is the wrong approach. Agencies should require best-value tradeoff evaluation selectively – for complex, knowledge-intensive, and cost-type procurements where the evidence shows it matters most. For routine commodity purchases, LPTA remains a defensible and efficient choice.
What It Means for Practitioners: Contracting officers should use contract characteristics as a guide for source selection. When a procurement involves specialized expertise, cost-reimbursement pricing, or thin markets, invest the time and resources in a tradeoff evaluation. When buying well-defined commodities with multiple capable suppliers, LPTA can deliver equivalent outcomes with lower administrative burden.
Caveats: The interaction effects are estimated within the Section 813 DiD framework and share that design’s limitations, including potential pre-trend violations for some outcome variables.
Full Paper: Research Papers
Single-Bid Awards in Federal IT Procurement: Prevalence, Predictors, and a Competition Paradox
The Question: How common are “competitive” procurements that receive only one bid, and does evaluation method affect whether firms show up to compete?
Key Finding: 41% of ostensibly competitive federal awards received only one offer. Civilian agencies had substantially higher single-bid rates than DoD. Contracts evaluated using tradeoff criteria were 3.5 times more likely to receive a single bid than LPTA awards. A difference-in-differences analysis suggests that restricting LPTA in DoD slightly increased single-bid probability, though this effect loses significance with clustered standard errors. Single-bid awards showed slightly lower cost growth, challenging the assumption that less competition always means worse outcomes.
What It Means for Policy: The single-bid rate is arguably a more urgent problem than evaluation method. When four out of ten “competitive” awards attract only one bidder, the choice between LPTA and tradeoff evaluation is largely academic. Congress and OFPP should prioritize competition-enhancing reforms – reducing entry barriers, simplifying proposal requirements, and expanding outreach – before further tightening evaluation method rules.
What It Means for Practitioners: Contracting officers should monitor single-bid rates in their portfolios and investigate root causes. If tradeoff evaluations are producing longer, more complex solicitations that discourage smaller firms from bidding, agencies should consider whether the evaluation complexity is proportional to the procurement’s actual risk.
Caveats: The 3.5x odds ratio is descriptive, not causal, because source selection method is chosen based on contract characteristics that also affect competition. The slightly better outcomes for single-bid awards may reflect selection effects rather than a true benefit of reduced competition.
Full Paper: Research Papers
Comparing Procurement Entry Barriers Across 13 National Systems
The Question: How do the costs and steps required to compete for government contracts in the United States compare to other countries?
Key Finding: US vendors face $30,000 to $1,100,000 in costs and 28 or more steps before submitting their first proposal. The cheapest system (Chile) requires just $425-$5,800– an 87-fold differential. Brazil’s reverse auction model produces per-bid costs 160 to 270 times lower than the US. Every country with qualification costs below $15,000 operates a full end-to-end digital procurement platform. The US does not.
What It Means for Policy: Barrier reduction may deliver greater competitive benefit than any evaluation method reform. Congress should fund modernization of federal procurement IT infrastructure, moving toward a single digital portal for registration, solicitation, and proposal submission. The current patchwork of SAM.gov, beta.SAM.gov, agency-specific portals, and paper-based processes imposes costs that deter competition from smaller and newer firms.
What It Means for Practitioners: Contracting officers control some barriers directly – solicitation length, proposal page limits, past performance requirements, and security clearance thresholds. Agencies should audit whether their requirements are proportional to contract risk or are simply inherited defaults that suppress competition.
Caveats: Vendor journey mapping documents formal requirements and published costs; it does not capture informal barriers such as incumbency advantages or relationship networks. Cost estimates are based on regulatory analysis and may vary by firm size and sector.
Full Paper: Research Papers
The Cost of Competing: Why US Procurement Barriers Undermine Evaluation Reform
The Question: Is the policy debate over LPTA versus best-value evaluation asking the wrong question entirely?
Key Finding: Combining evidence from 654,307 federal contracts and a 13-country comparative analysis, this paper argues the LPTA-versus-tradeoff debate is misframed. When 41% of competitive awards receive only one bid and US vendors face costs up to 87 times higher than the lowest-barrier countries, evaluation method is not the binding constraint on procurement outcomes. Countries with simpler entry requirements often report superior procurement performance regardless of which evaluation method they use.
What It Means for Policy: Congress and OFPP should rebalance reform priorities. The last decade of acquisition legislation has focused heavily on restricting LPTA. The evidence suggests that investing in barrier reduction – digital platforms, simplified registration, reduced compliance costs – would do more to improve outcomes than further evaluation method mandates. Agencies should consider barrier reduction a prerequisite for evaluation reform, not an afterthought.
What It Means for Practitioners: Before debating whether to use LPTA or tradeoff evaluation on a given procurement, contracting officers should ask whether enough firms can realistically compete. If the answer is no, the evaluation method is secondary. Reducing unnecessary proposal requirements, shortening solicitation documents, and actively conducting market research to identify potential bidders are higher-leverage actions.
Caveats: The international comparison documents associations, not causal effects. Countries with lower barriers may differ in other ways (market size, regulatory culture, corruption levels) that also affect procurement outcomes.
Full Paper: Research Papers
Section 813 at Seven: An Empirical Assessment of Congressional LPTA Restrictions in Federal Procurement
The Question: Seven years after Congress restricted LPTA use in defense procurement, did the law achieve its objectives, and what should lawmakers do next?
Key Finding: Section 813 produced statistically significant improvements – 30.3-percentage-point reduction in cost growth and 0.55 fewer modifications per contract (both p < 0.001) – but there is no detectable first-stage effect on actual LPTA usage rates. DoD’s post-treatment LPTA rate (39.8%) is virtually identical to civilian agencies (38.8%) that were not subject to the restriction. The law’s “maximum extent practicable” standard created an implementation gap that allowed contracting officers to maintain existing practices while technically complying.
What It Means for Policy: Congress should strengthen the statutory language in future LPTA restrictions by replacing “maximum extent practicable” with affirmative justification requirements. Agencies should be required to report source selection method choices and document why LPTA was selected when it is used for covered categories. The 41% single-bid rate undermines competition regardless of evaluation method and deserves separate legislative attention.
What It Means for Practitioners: The current statutory framework gives contracting officers wide discretion to continue using LPTA even in restricted categories. Officers should understand that future legislation may close this gap. Proactively adopting tradeoff evaluation for complex services – and documenting the rationale – positions agencies ahead of likely regulatory changes.
Caveats: This analysis frames findings for a legal audience and proposes legislative reforms. The underlying empirical estimates share the limitations of the DiD design described in Paper 1, including FPDS data quality concerns for source selection fields prior to FY2020.
Full Paper: Research Papers