Sectorshift Share

GEOGRAPHY & CARTOGRAPHY CALCULATOR Sectorshift Share A precise tool.
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What is the Sectorshift Share & How does it work?

Shift‑share analysis is a classic tool in regional geography that decomposes employment change into three interpretable components: the part attributable to overall national growth, the part due to the specific industry mix of the region, and the residual regional shift that reflects local competitive advantage or disadvantage.

The method starts with a base‑period employment figure for the region (E⁰) and projects what the employment would have been if the region had followed the national growth rate (gβ‚™). The difference between this projection and the actual current employment (E) is then split into an industry‑mix effect, based on the region’s share of a faster‑growing industry (gα΅’), and a regional shift effect that captures all other local factors.

By quantifying these components, planners can identify whether a region’s performance is driven mainly by broader economic trends, its industrial structure, or unique local dynamics, informing targeted policy interventions.

\Delta E_i = E_i^{0} cdot g_n + E_i^{0} cdot (g_i – g_n) + (E_i – E_i^{0}) cdot (g_i – g_n)
Delta E_i = total employment change for sector i; E_i^{0} = base‑period employment; g_n = national growth rate; g_i = industry growth rate; (E_i – E_i^{0}) = actual change.
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Frequently Asked Questions
What is shift-share analysis?
Shift-share analysis is a method used in regional geography to break down changes in employment into three components: national growth, industry mix, and local competitiveness.
How does the shift-share analysis start?
The analysis begins with a base-period employment figure for the region and projects what the employment would have been if the region had followed the national growth trend.
What are the three components of shift-share analysis?
The three components are: the part attributable to overall national growth, the part due to the specific industry mix of the region, and the residual regional shift reflecting local competitive advantage or disadvantage.
Why is shift-share analysis useful in geography?
Shift-share analysis helps identify factors contributing to employment changes in a region, allowing for better understanding of local economic dynamics and competitiveness.
Can this tool be used for other types of data besides employment?
While primarily used for employment data, shift-share analysis can be adapted to analyze other types of regional economic indicators or even non-economic variables.

Results are for informational purposes only and do not constitute professional advice.