A recent C.D. Howe Institute report found 90 per cent of the black market would disappear if pot cost $9 per gram, projecting $675 million a year in federal and provincial revenues if governments only applied existing sales taxes.

i think this is probably close to right, so long as an economy of scale is maintained. otherwise, the predictable outcome is that the legal market only reaches young people, while older people keep the black market running.