[TimPC]

There are similarities undoubtedly. I think the major difference is the source of the distorted subsidy. In the market for lemons bad cars are subsidized by people thinking they might be good ones. In the voucher system low cost students are handed a massive subsidy by government pretending they have average cost. I think the voucher market is more dangerous since government ends up on the hook for all the increased costs of education because of the artificial subsidy.