Abstract After defining and providing the current status of psychological capital (PsyCap), we address the need to better understand its stability (i.e., state vs. trait). Specifically, we issue a call for longitudinal research. The balance of this “incubator” article examines the relevance, potential obstacles, and advantages of this design in meeting PsyCap's future research needs. Copyright © 2008 John Wiley & Sons, Ltd.
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