This study investigates changes in the persistence of the S&P Composite dividend-price ratio. Recently developed tests are employed that allow for breaks between periods in which the data are integrated of order zero, I (0), and integrated of order one, I (1). One of the tests finds a break from I (0) to I (1) in the mid-1970s and two of the tests find a break from I (0) to I (1) in the early, to mid-1950s. The results are discussed in light of the rational bubble hypothesis.
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