Many different publications carry the same story on the same day with the same details. The reason is that a small number of agencies produced the underlying report.
The economics favour shared reporting
Maintaining correspondents in many countries is expensive, and few outlets can justify it for coverage their audience consumes occasionally.
A wire service spreads that cost across every subscriber, making comprehensive international and national coverage affordable for publications that could never fund it alone.
The arrangement is efficient and it means the original reporting for a large share of published news comes from a handful of organisations.
Selection happens upstream
A wire service decides which events to staff and file on, and those decisions propagate to every subscriber simultaneously.
An event no agency covers is effectively invisible to outlets without their own correspondent, regardless of its significance in the place it occurred.
This is a structural filter rather than an editorial position, driven by where bureaus are located and which languages the staff work in.
Framing travels with the copy
Subscribers often republish wire copy with minimal editing, so the headline, the choice of opening fact and the description of participants carry through unchanged.
Where an outlet does rewrite, it usually starts from the wire version, which anchors the framing even when the final text differs considerably.
Agencies write to a deliberately neutral standard because their subscribers span the political range, and that neutrality is a commercial requirement as much as an editorial value.
The agenda-setting effect compounds
Editors judge importance partly by what other outlets are running, and when most of them are running the same wire item, the signal is self-reinforcing.
A story that appears everywhere at once is treated as major news, which attracts follow-up reporting and drives the subsequent coverage cycle.
Stories that no agency filed receive none of that reinforcement and generally remain local regardless of merit.
Verification concentrates too
Agencies maintain standards and correction procedures, and their output is checked by editors who know the region, which is a genuine quality advantage over unverified sources.
The corresponding risk is that a single error propagates across thousands of outlets before it is caught, and the correction reaches a fraction of them.
Readers who notice several publications carrying identical wording are seeing one source rather than several, and independent confirmation requires finding reporting that did not come off the wire.