The Structural Obstacles

The employer market has more freedom to innovate than Medicare and more resources than Medicaid, and it has moved toward value-based care more slowly than either. The reasons are structural, and naming them precisely matters more than exhorting employers to try harder.

Fragmentation on the buy side, concentration on the sell side

No individual employer represents enough volume to move a health system. Meanwhile providers have consolidated, and the consequence is measurable. Cross-market hospital mergers increased acquirer prices by 12.9 percent six years after acquisition, rising to 16.3 percent for serial acquirers, with “no discernible impact on mortality and readmission rates for heart failure, heart attacks and pneumonia.” Insurer bargaining leverage is “lessened at greater levels of hospital consolidation.”

The trend is toward greater asymmetry, not less.

The turnover problem

Median employee tenure was 3.9 years in January 2024, the lowest since January 2002. Investments in prevention and chronic disease management pay back over longer horizons than that.

This is a collective action problem. Each employer faces the same truncated window, each rationally prioritizes fast returns, and the sum of individually rational decisions is systematic underinvestment in the highest-value long-run interventions.

Attention and capability

Health benefits sit inside human resources at most firms and compete with recruiting, compensation, and everything else. Sophisticated purchasing requires claims analytics, actuarial judgment, contracting expertise, and clinical input. The data course described that stack, and few employers below the largest tier have it or can justify building it.

The default is therefore to delegate to a broker and a carrier, which returns the employer to the position Module 1 described: holding the risk without holding the negotiation.

Member disruption

Every effective cost lever in the commercial market imposes something on employees. Narrow networks remove providers people use. Tiering raises costs for the non-preferred choice. Site-of-service steering redirects care people expected to receive at their hospital. High deductibles shift exposure onto members directly.

An employer weighing a strategy that saves 3 percent against the risk of visible employee dissatisfaction in a competitive labor market will frequently choose not to act, and that calculation is not irrational.

Worth remembering: these four constraints interact rather than simply adding up. Fragmentation means the employer has little leverage, so the available levers are the disruptive ones. Disruption is costly in a tight labor market, so employers hesitate. Turnover shortens the payback, so the patient investments look worse than the disruptive ones. Limited capability means the analysis to distinguish good options from bad ones often does not get done. Any proposal for employer-led reform that addresses only one of these will underdeliver, which is a large part of why so many have.

Key takeaways

• Employers buy in fragments while providers consolidate, and consolidation demonstrably raises prices without improving measured outcomes.
• Median tenure of 3.9 years truncates the return on prevention, producing rational underinvestment.
• Most employers lack the analytic and contracting capability that sophisticated purchasing requires.
• Every effective cost lever imposes visible disruption on employees, which employers weigh against labor market competition.

Sources

• Arnold et al., New evidence on the impacts of cross-market hospital mergers on commercial prices and measures of quality, Health Services Research 2025 (opens in a new tab)
• Li et al., How do hospitals exert market power? Evidence from health systems and commercial health plan prices, Health Affairs Scholar 2025 (opens in a new tab)
• U.S. Bureau of Labor Statistics, Employee Tenure in 2024 (opens in a new tab)