106. Property taxes are typically set at a flat rate per $ 1,000 of officially assessed value. Reassessments should be frequent in order to remove distortions that arise when property values change at differential rates. In practice, however, reassessments typically occur when they benefit the government – that is, when their effect is to increase total tax revenue.
由于受到粗体字意思的限制，我读不懂此句，望高人赐教！
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