Of course, in the new market equilibrium, the wage of labor tends to equal its total marginal disutility to the worker (p. 
4.8:10), which now includes the marginal tax.  But the quantity of labor exchanged has also diminished, altering both its supply and its demand.  Consequently, it would be a gross oversimplification to conclude that the worker passes on the new marginal tax by charging a correspondingly higher wage.