The paper uses the fortunes of religion in the Nordic and Baltic States to
identify weaknesses in the supply-side model of religious behaviour promote
d by Stark, Finke and Iannaccone. Changes in religious observance in the No
rdic countries over the twentieth century, and comparisons between them, co
ntradict a number of supply-side propositions. Comparisons between the Balt
ic states similarly show no support for supply-side claims. Instead both cl
usters suggest that the fate of religion owes more to its links with ethnic
ity than to issues of state regulation.