When Mobility Meets Market Power
Fossil-fuel workers do not enter a blank map after displacement. They enter destinations with different concentrations of employers, different uses for their skills, and different capacity to make competing offers. The question here is how those destination conditions interact with a worker’s sectoral and geographic path, so that readers can distinguish a genuinely broader opportunity set from a merely different place to search.
The distinction matters because “more jobs” and “more bargaining power” are not the same thing. A city may contain many employers overall while offering only a few employers for a specialized fossil-fuel occupation. A worker may leave fossil fuel and still face weak competition among the employers who can use the worker’s experience. Conversely, a worker who remains in fossil fuel may benefit from outside offers if the broader local market is competitive enough. The destination labor market is part of the recovery mechanism, not background scenery.
Two measures of a destination’s competition
The Census study separates destination conditions into two concentration measures. The first is fossil-fuel-specific HHI, a measure of how concentrated employment is among employers within the relevant fossil-fuel subsectors. It is most directly connected to the bargaining conditions of a worker who remains in fossil fuel. The second is all-sector HHI, which captures concentration among employers across the local economy. It is a proxy for the breadth of outside options available whether or not the worker leaves fossil fuel.
An HHI is not a headcount of vacancies and not a direct observation of how a firm behaves in wage negotiations. It summarizes employment shares: a market dominated by a few employers receives a higher concentration measure, while employment spread across more employers receives a lower one. The study fixes the concentration measures using average values from 1990 through 1994, before the worker separations in its analysis, and classifies destinations above or below the median. This timing helps reduce the possibility that the displacement itself created the measured destination condition.
The two measures answer different questions. Fossil-fuel-specific concentration asks: if this worker continues to sell fossil-fuel skills, how many relevant employers can plausibly compete for them? All-sector concentration asks: if the worker needs to switch occupations or industries, how many employers across the local economy can create credible alternatives? The questions overlap for some workers, but they are not interchangeable. A metropolitan area can have a low all-sector HHI and a high fossil-fuel HHI if a few energy firms dominate its specialized niche.
This distinction gives the recovery model an interface between skills and wages. Skill portability determines which employers can use a worker’s capabilities. Concentration determines how hard those employers must compete for the worker. If a worker’s experience transfers widely but all-sector concentration is high, many nominal openings may still sit inside a small number of firms or offer weak bargaining conditions. If fossil-fuel concentration is high but the worker can switch into several unrelated occupations, the worker may escape the niche’s wage-setting power, although the new match may price only part of the old experience.
The study’s results for workers who neither switched sectors nor moved make the first connection visible. In destinations with high fossil-fuel concentration, these workers suffer large and persistent losses.