Suppose that there is a social benefit (positive externality) incurred when children aged 2 to 4 are provided with good quality private daycare services run by caring, intelligent, trained professionals, as opposed to being subjected to poor-quality care or staying at home until they are school-aged. However, this positive externality occurs only after a 10- to 20-year lag, as the children who have been exposed to high-quality care go on to become more productive, more law-abiding, better-socialised, happier people once they become adults. What methods might the government employ to ensure that a socially efficient level of this service is provided for children?
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