The study finds that in the years leading up to such a bidding war, winners and losers were similar in terms of employment, salaries, and productivity. But after, the winners’ productivity surged. These productivity gains, which appeared to reflect knowledge spillovers, were particularly large for existing plants that shared similar labor and technology pools with the new plant. Thus, by making existing producers more productive, a new plant generated an important benefit—a positive externality—for the rest of the country’s establishments. This higher productivity led to more jobs and higher wages. So, the provision of subsidies might be seen as a way to internalize this externality. 

이 문단입니다... 정말 해석을 어떻게 해야할지모르겠습니다.

중간중간에 , , , , 콤마가 계속나오는데 이럴때 어떻게 자연스러운 독해를 해야할지도모르겟고...

그외의것들도 해석이 깔끔히되질않네요.... 독해고수형님들 꼭 도와주십시오 .ㅜㅜ