External hires get paid more but perform worse early and quit more often. The research on internal moves, retention, and why employers keep hiring outside anyway.
Conventional career advice says the fastest way to a raise is to leave. The wage data backs that up: external hires command a premium. But a decade of research, anchored by Matthew Bidwell's study of investment-bank personnel records, shows that premium buys employers a worker who performs worse for the first two years and is more likely to leave. This page collects the published evidence on how internal mobility compares to external hiring — for pay, performance, and retention — and why employers keep reaching outside despite saying internal moves matter.
Bidwell analysed personnel data from a US investment-banking division (2003-2009) and found external hires earned roughly 18-20% more than workers promoted into comparable roles internally. He replicated the pattern at a second investment bank and a publishing company.
Despite stronger observable credentials (more experience and education), external hires scored worse on performance evaluations for roughly two years — the time Bidwell argues it takes an outsider to learn how to be effective inside a new organisation. If they survived past two years, they were then promoted faster than internal movers.
Bidwell documented both a greater risk of being let go during the first few years and a higher likelihood of leaving voluntarily, relative to internally promoted employees. The "paying more to get less" label captures the combination: higher pay, lower early performance, higher turnover.
LinkedIn's 2022 Workplace Learning Report found that companies that excel at internal mobility keep employees an average of 5.4 years, versus 2.9 years at companies that struggle with it. This is a correlation in vendor-produced data, not a controlled causal estimate, but it points in the same direction as the academic work.
Sources: [3]
Deloitte's 2019 Global Human Capital Trends survey found over 50% of respondents said it was easier for employees to find a job outside their organisation than inside. Only 6% rated themselves "excellent" at moving people between roles, and 76% called internal mobility important — a large say-do gap.
Sources: [4]
Gartner has tracked rising deployment of internal talent marketplaces among large enterprises and flagged internal mobility as a top HR focus heading into 2026. Adoption remains a minority practice, and Gartner notes that despite investment, measured internal-mobility rates have been slow to move.
The performance, pay, and turnover findings come from peer-reviewed work (Bidwell, Administrative Science Quarterly, 2011) summarised against the publicly available Knowledge at Wharton write-up. Retention and marketplace figures are from vendor and advisory reports (LinkedIn, Deloitte, Gartner); we label these as correlational survey data rather than causal estimates, and cite the earliest primary source we could locate for each number.
For job seekers, the external-hire premium is real — switching firms is still the fastest route to a raise. But the same data is a warning: as an outside hire you start behind on perceived performance and are watched more closely in year one. Lean into a fast, visible ramp. For anyone weighing an internal move, the trade is lower pay growth for a measurably easier start and longer expected tenure. And if your current employer is bad at internal mobility, the evidence says you are not imagining it — most organisations are.
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