fresinha maybe this will help :http://www.agriculture.purdue.edu/agcom ... d_less.htm
To quote :
"you should only use “over,” “under,” “above,” “below,” “higher,” and “lower” to describe physical relationships in space. For just about everything else — especially numbers — use “more” or “less.”
The bear climbed over the mountain. The eggs are under the toast. The detergent is in the cabinet above the washing machine. The creepy basement is below the trapdoor. The ceilings here are higher than in our old place. The river is lower than it was last week. But there are more than 100 people here and less than half of them know what they are doing."