translate English to French: The WITB increases these rates on earned income between $10,000 and $20,000, as it is being phased out. However, this increase occurs over an income range where average effective marginal tax rates are relatively low.
En revanche, la diminution progressive de la PFRT fait augmenter les TEMI sur la tranche de revenu de 10 000 $ à 20 000 $, où ils sont actuellement relativement bas.