Given the Target and Argument texts detect the stance that the argument has towards the topic. There are three types of stances "in favor", "against", and "neutral". 

Topic: Cellulosic ethanol
 Argument: There is not enough land too grow sufficient cellulosic ethanol.
against

Topic: Merit pay for teachers
 Argument: Merit pay punishes teachers assigned to bad students.
against

Topic: 700 mile US Mexico border fence
 Argument: The 700 mile fence is not relatively expensive.

in favor