Abstract
This study analyzes the trade‐off between strategic flexibility and commitment for cases of simultaneous and related strategic investments under high levels of uncertainty. It develops a model that, using a Cournot game and real option theory, demonstrates that (1) a correlated strategic investment adds value to a portfolio of ongoing strategic investments in a decreasing marginal fashion, and (2) the new investment delays the development of the other investments. Managers who fail to recognize these properties may make strategic commitments that destroy value, even in the presence of options with individual positive values. An important feature of the model is that competitive advantages may flow from market power or from the capability of managing the portfolio.