Minimum Wage Increases and Workplace Injuries: Evidence on Firm Responses to Higher Labor Costs

Debates over minimum wage policy have historically centered on a relatively narrow set of outcomes, most notably employment effects and wage gains. This focus, while analytically expedient, risks obscuring a broader set of firm responses that operate through non-wage aspects of work.

A recent study co-authored by Professor Anna Stansbury contributes to a growing literature that examines these non-wage margins. Specifically, the paper investigates how minimum wage increases affect workplace health and safety, an outcome that is both economically meaningful and, until recently, underexamined.

Using administrative data on more than 13 million workers’ compensation claims in California between 2000 and 2019, the authors document a consistent, quantitatively meaningful relationship: increases in the minimum wage are associated with higher workplace injury rates.

The headline estimate is straightforward. A 10% increase in the minimum wage leads to approximately two to three additional injuries per 1,000 low-wage workers annually. While modest in absolute terms, this effect scales considerably when aggregated across large labor markets and is concentrated among workers whose pay is close to the minimum wage.

How Firms Adjust to Higher Minimum Wages

The central contribution of the paper lies less in the magnitude of the effect than in its interpretation. Standard models of minimum wage policy tend to emphasize employment adjustments, implicitly assuming that firms respond to higher labor costs primarily through hiring decisions.

However, firms possess a broader set of adjustment mechanisms. They can alter scheduling, benefits, capital intensity, and, crucially, the pace and organization of work itself.

Specifically, as labor costs increase, firms may respond by increasing output per worker to recoup those higher labor costs, effectively accelerating the pace and pressure of production. The evidence presented in this study is most consistent with this work intensification response. 

In particular, the authors find that cumulative physical injuries, those associated with repetitive strain rather than discrete accidents, increase at roughly twice the rate of overall injuries following minimum wage hikes. This pattern is difficult to explain as random variation and instead points toward systematic changes in work intensity.

A secondary, though less directly testable, mechanism involves reductions in safety-related expenditures. Faced with higher wage bills, firms may economize on maintenance, training, or protective equipment. While the available data do not allow this mechanism to be isolated, it remains consistent with the observed increase in both minor and severe injuries.

Size and Duration of the Effects

The estimated effects are both economically meaningful and persistent. Injury rates increase alongside minimum wage hikes and then decline gradually over subsequent years, following a similar pattern to wage effects.

The effects are highly heterogeneous across workers and occupations. They are concentrated in low-wage occupations where a large share of workers earn near the minimum wage. In higher-wage occupations, where exposure to minimum wage changes is limited, the study finds little to no effect on injury rates.

This pattern supports a causal interpretation of the results, and the findings are consistent across multiple additional tests.

Welfare Implications

From a welfare perspective, the results introduce a notable complication. Minimum wage increases do, as intended, raise earnings for low-wage workers. However, the associated increase in injury risk partially offsets these gains.

The authors estimate that the welfare cost of increased workplace injuries reduces the net benefit of higher wages by approximately 10% to 20%. This does not overturn the case for minimum wage increases, but it does suggest that standard evaluations may overstate their net benefits if they overlook non-wage aspects of job quality.

Implications for Policy Design

The broader implication is not that minimum wages are misguided, but that they are incomplete. Policies that raise labor costs without addressing the conditions under which labor is performed may induce offsetting adjustments that erode some of their intended benefits.

This points toward a need for a more integrated approach to labor market policy. If minimum wage increases generate incentives for work intensification, complementary policies, such as enhanced workplace safety enforcement or incentives for capital investment in safer production processes, may be necessary to preserve worker welfare.

More generally, the findings underscore the need to expand the evaluative framework for labor market interventions. Outcomes such as workplace safety, job strain, and non-wage amenities are not peripheral considerations; they are central components of job quality and, by extension, worker wellbeing.