“…In practice, to be sure, some research suggests the importance of multiple or stochastic breaks (e.g., Pesaran and Timmermann, 2002; Rapach and Wohar, 2006). However, there are enough studies finding just a single break (e.g., Hooker, 2002; Estrella et al, 2003) to suggest practical value for our theoretical results. The local approximation, used in much of the literature on structural break tests, makes the analytics more tractable (as noted above, the local asymptotics allow us to derive closed form solutions under assumptions somewhat more general than in related prior work) and is consistent with the common view that, in practice, breaks are small enough that conventional tests have low power (see, e.g., the power discussion in Cogley and Sargent, 2005).…”