Yes, but this is another topic. In practice the middle classes (there are too few very rich children to really matter) respond to the 'incentive' just as well a

Yes, but this is another topic. In practice the middle classes (there are too few very rich children to really matter) respond to the 'incentive' just as well as the poor. In Australia anti-vaccination is a middle class phenomenon, the poor (in the main) are not against vaccination and just need an effective reminder to vaccinate.