So is the government doing that? Sadly, the answer appears to be "no". I asked both Treasury and the Ministry of Health for any advice or assessment of the impact of long covid on New Zealand. And Treasury - the government's chief economic advisor, who run the cost-benefit analsis ruler over every policy - hasn't been thinking about it at all.
(Ministry of Health's response isn't due until mid-July, but I'd expect their focus to be more on the health system rather than broader economic effects).
This isn't very reassuring. This is a huge potential cost to our society, as well as a huge impact on people's lives. And the government's chief economic advisor is apparently blind to it. Which means they'll be systematically under-estimating the benefits of covid control (in reducing those costs), and likely doing less to control covid than they would if those costs were included. And that is not a recipe for good policy, or for trust in government.