Yes it is true. Basically the formula for your taxes are (appraised home value / total appraised value of all houses in the town) * budget of the town. The market does absolutely take it in effect, like I said, towns with lower taxes sometimes become wealthy enclaves were people will drop 2 mil on a house and then have basically no taxes. My only issue with the system is it winds up being regressive sometimes because the wealthier an area is the lower the taxes tend to be.