Before revision:  Finally, we test how it correlates with choices of vertical integration  made by 20,489 U.S. parent companies controlling 154,836 affiliates worldwide. We find that a higher Input Rank is positively associated with higher odds that that input is vertically integrated, relatively more when final demand is elastic. A supplier's Input Rank remains a significant predictor of a firm's decision to integrate even after controlling for the relative positions on upstreamness(downstreamness) segments .
After revision:  Finally, we test how it correlates with choices of vertical integration made by 20,489 U.S. parent companies controlling 154,836 subsidiaries worldwide .