Prices shouldn't be uniform — things differ in nature; why force them to be the same?
Tips
history
From 《孟子·滕文公上》: '夫物之不齐,物之情也。或相倍蓰,或相什百,或相千万。' Mencius rebuts a rival's idea that all goods should be priced by size alone — quality varies, so prices must too.
usage
夫 (fú, 2nd tone) here is a classical sentence-opener marker, not 'husband.' Same character, different reading.