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We build a simple model of legal dualism in which a pro-poor legal reform, under certain conditions, causes the conflicting custom to go some way toward producing the change intended by the legislator. It then acts as an 'outside anchor' that exerts a 'magnet effect' on the custom. We illustrate...

We build a simple model of legal dualism in which a pro-poor legal reform, under certain conditions, causes the conflicting custom to go some way toward producing the change intended by the legislator. It then acts as an "outside anchor" that exerts a "magnet effect" on the custom. We illustrate...