In accordance with the dual-control approach, suppose New Mexico’s NO_X abatement standard for existing sources is 5 units (A_E) and the EPA's standard for new sources is 12 units (A_N). If the two types of sources face the following MAC functions, where each MAC is in thousands of dollars, what economic criterion is violated? Show how you know. 

Existing: MAC_E = 1.8A_E

New: MAC_N = 1.2A_N