Difference-in-Discontinuities

[arutyunovv]

Background article: Grembi et al. (2016); Butts (2023)
Notes: the difference-in-discontinuities designs combines DiD and RDD. The (very) basic idea behind it is to estimate discontinuities in two different periods, and take the difference between these discontinuities to identify a causal effect. The article by Grembi et al. (2016) is virtually the first one to apply this technique and although it is an empirical article and not a purely econometric one, the authors go into some depth to develop and explain their novel methodology. Butts (2023) extends this by applying it to spatial/geographic RDD settings providing a more formal econometric treatment of this methodology.