Two-sided network effects in card payment systems are analysed under different market structures, e.g., competition, one-sided monopoly, bilateral monopoly and duopoly; with and without an interchange fee; for the so-called Baxter's case of non-strategic merchants. A partial ranking of market...

Using a set of standard success criteria, we show that Riksbank foreign-exchange interventions between 1993 and 2002 lacked forecast value; that is, the observed number of successes was not significantly greater - and usually substantially smaller - than the number one would anticipate given the...