This video cover the Rybczynski Theorem, which asks: what happens if a factor of production increases in one country? Under some assumptions, the theorem hypothesizes that if labor migrates into a country, output and exports of the labor-intensive sector will go up. Also, output and exports of the capital-intensive sector will go down. This video also discusses how this theorem can be applied to real-world situations.
http://mruniversity.com/courses/international-trade-coming-soon/rybczynski-theorem