A tax only on rent is a twice-single tax, single in terms of there being only one type of tax and single in being only one payment for government services. Aside from removing a burden to growth and enterprise, there is another benefit from the rent tax in being single. With only one tax, people can tell just how much they are paying for government. With today's 101 different taxes, many of them indirect and hidden, nobody knows how much they are paying for government. Very few people add up all the sales taxes they pay, and few have any clue as to how much more they pay for goods when taxes on businesses are passed on to the consumers.
Taxes are a lot higher than most people think.
For example, some lands are valuable because they are located in the city, the value coming from commerce. Farm lands are valuable because of the fertility, including the climate, as well as their proximity to convenient transportation. The value of mineral lands comes from the value of the natural materials in the ground. In my experience in teaching and talking about taxes and land, most people are in favor of shifting to the single tax once they learn about it. We can blame the greed of those owning a lot of land for blocking the tax shift, but the majority, who would benefit from the shift, are not agitating for it, because of ignorance and apathy.