Traditionally, economists have tried to estimate what is the true cost of raising a dollar of revenue, allowing for the dead-weight loss that comes from people simply not undertaking activities that they might have, were there to be a lower tax rate—for example, when firms are trying to compete, and we hope soon that we'll be able to be competing for skilled labour across the world and people will be able to move around again. The Minister will be interested to know the UK is going to be rolling out a vaccine next week, but the world is changing very quickly. I didn't believe the Minister when he said at the University of Otago several months ago that there might be a vaccine in the first quarter of 2021. It turns out he was not only correct; he was a little bit late in what seemed to be a bold estimate at the time. 