Biomedical Papers Award First Authorship to Execution, While Economics Alphabetizes to Presume Parity

A researcher’s career trajectory is dictated entirely by the discipline they chose, because the exact same contribution to a five-person project yields full tenure credit in one building and zero in the next. The rules governing whose name goes where on a published paper determine who gets funded and who leaves academia.[1]

In the biomedical sciences, the first author executed the experiment and the last author secured the funding. In economics, the authors are listed alphabetically, and the discipline presumes they contributed equally to the theoretical framework.[1]

This divergence creates a structural barrier for multidisciplinary research and forces hiring committees to translate foreign credit systems. A middle author in a medical journal is a technician, while a middle author in an economics journal is a principal investigator whose last name happens to start with M.[1]

The International Committee of Medical Journal Editors established the biomedical standard to tie public accountability to specific roles. Their guidelines require that every listed author made a substantial intellectual contribution, but the sequence of those names carries the actual economic value.[2]

The Biomedical Execution Premium

Biomedical research operates on a strict hierarchy where the first and last positions hold all the professional equity. The first author is typically a doctoral student or postdoctoral fellow who designed the methodology, ran the assays, and drafted the manuscript.[1]

Securing a first-author publication in a high-impact journal is the explicit currency required to transition from a trainee to an independent researcher. Without it, a postdoctoral fellow cannot successfully compete for federal transition grants from the National Institutes of Health.[1]

The final position on the byline belongs to the principal investigator, the senior scientist who conceptualized the broader research program and secured the grant funding. This anchor position signals laboratory leadership and is required for tenure and grant renewals.[1]

Everyone listed between the first and last author occupies the middle-author void. These researchers provided specialized assays, statistical analysis, or patient cohorts, but their position yields effectively zero weight in formal promotion algorithms at major research universities.[1]

A 2024 scientometric analysis of grant scoring found that reviewers assign no independent investigator credit to middle-author publications. The system treats them as technical support rather than scientific leadership, regardless of the actual hours invested in the project.[3]

The study's authors concluded that the biomedical credit model is entirely binary. "Reviewers assign exactly zero independent investigator weight to middle-author publications when evaluating a candidate's readiness for federal funding," the Journal of Informetrics researchers wrote.[3]

The Economics Parity Presumption

Economics approaches collaboration through a fundamentally different theoretical lens, treating a published paper as an indivisible joint product. The American Economic Association reports that 84 percent of papers published in its flagship journals between 2015 and 2025 used strict alphabetical ordering.

This convention signals that all listed authors share equal responsibility for the theoretical framework, the mathematical proofs, and the empirical analysis. Hiring committees in economics departments formally divide the credit by the number of authors, assigning a 33 percent fractional share to each person on a three-author paper.[1]

Because the order conveys no information about effort, an economist named Adams and an economist named Zimmer receive the exact same formal credit for their collaboration. There is no principal investigator slot and no designated junior execution role.[1]

The American Economic Association defends this practice as a safeguard against credit disputes.[1]

"Alphabetical ordering denotes a presumption of equal contribution among all listed co-authors, preventing senior faculty from expropriating the execution credit of junior theorists," the association's 2025 author disclosure guidelines state, cementing the discipline's egalitarian ideal.

Measuring the Alphabetical Penalty

However, the alphabetical convention introduces a documented market distortion known as the alphabetical penalty. Because human readers naturally associate the first listed name with leadership, economists with early-alphabet surnames accumulate informal prestige faster than their peers.[1]

Stanford University researchers Liran Einav and Leeat Yariv demonstrated that economics faculty with surnames in the first third of the alphabet are significantly more likely to receive tenure at top-tier institutions. They are also more likely to be elected as fellows of the Econometric Society.

The researchers isolated this effect entirely to disciplines that alphabetize their bylines. "The alphabetical norm in economics systematically disadvantages researchers with late-alphabet surnames in the tenure process, an effect that vanishes entirely in psychology and medicine," Einav and Yariv wrote in the Journal of Economic Perspectives.

To mitigate this bias, some economics journals have introduced randomized author ordering, using a specialized symbol to indicate that the sequence was determined by a coin flip. This allows researchers with late-alphabet names to occasionally appear first without violating the parity presumption.[1]

The American Economic Association now allows authors to officially certify randomized order during the submission process. Despite this technical solution, adoption remains at just 6.4 percent, as established researchers hesitate to abandon a convention that readers already understand.

Collisions in Multidisciplinary Science

The rigid boundaries between these two credit systems collapse when economists and medical researchers collaborate on public health or health economics papers. The resulting byline negotiations often take longer than the peer review process itself.[1]

If a multidisciplinary team publishes in a medical journal using alphabetical order, the biomedical researchers forfeit their career credit, as their tenure committees will read the sequence as a measure of effort. The economist whose name starts with Z becomes the presumed principal investigator.[1]

Conversely, if the team publishes in an economics journal using the biomedical effort-based sequence, the economics community assumes the order is alphabetical. They will assume the author named Adams contributed equally, even if Adams was merely a laboratory technician.[1]

To navigate this structural incompatibility, journals have introduced the co-first author designation. A footnote explicitly states that two or more authors contributed equally to the work, allowing both to claim the execution premium in their respective departments.[1]

The evidence shows that co-first authorship has increased by 435 percent between 2014 and 2024 in journals like JAMA and The Lancet. This inflation dilutes the value of the first position, as hiring committees must now divide the execution credit among multiple candidates.[4]

The Shift in Empirical Research

The economics parity model is currently fracturing under the weight of big data and laboratory-based behavioral economics. As the discipline shifts from theoretical mathematics to empirical field experiments, the division of labor increasingly resembles a biomedical laboratory.[1]

Running a randomized controlled trial in development economics requires a principal investigator to secure funding and a team of junior researchers to clean the data. The alphabetical model fails to accurately describe this hierarchical production process.[1]

Consequently, empirical economics papers are beginning to adopt the biomedical sequence, placing the junior data scientist first and the senior grant-holder last. This transition creates a bifurcated discipline where theoretical and empirical economists operate on different professional currencies.[1]

The evidence for this shift is visible in the National Bureau of Economic Research working paper series, where non-alphabetical ordering has doubled since 2015. The transition remains incomplete, leaving current hiring committees to guess which credit system a specific paper is using.[5]

The primary uncertainty in the economics model lies in how junior researchers signal their specific technical skills to the job market. Without a designated first-author position, a newly minted doctorate relies heavily on private recommendation letters to claim credit for a project's mathematical heavy lifting.[1]