Abstract
Partnerships are usually summarized by average returns, average sales gains, or average duration. That summary is often too compressed for operating decisions. Commercial collaborations can miss their launch path in uneven ways, with short periods of underperformance, abrupt breaks in demand realization, and long episodes of slow recovery that are not visible in mean outcomes. This paper studies partnership outcomes through the dynamics of deviation, repair, and renewal rather than through a single average performance statistic. The empirical setting is a large panel of branded joint launches in U.S. consumer markets observed monthly from prelaunch planning through post-launch adjustment and contract renewal. The design links realized market performance to internal coordination structure, partner asymmetry, crowding in each partner’s alliance portfolio, and the timing of corrective commercial actions. The analysis proceeds in three steps. A synthetic-control benchmark first constructs the sales path that each launch would have been expected to follow in the absence of the focal partnership structure. A hidden-state model then separates normal fluctuation from economically meaningful distress months. Finally, recovery duration and contract renewal are estimated as distinct but connected outcomes. The results show that partnerships are not primarily differentiated by average demand lift alone. The more informative separation lies in whether the partnership remains in a stable operating state, how rapidly it returns after a negative break, and whether the relationship is renewed after the initial term. Launches with concentrated task overlap, large commercial asymmetry, and crowded partner portfolios enter distress earlier and stay there longer. Staged rollout discipline and rapid corrective reallocation shorten recovery. Deep integration improves outcomes only when asymmetry is limited. Renewal depends less on the size of the first shock than on whether partners demonstrate credible repair capacity after the shock occurs.