If legalization reduced current narcotics enforcement costs by one-third to one-fourth, it might save $6 - $9 billion per year.
enforcement costs by one-third to one-fourth is much less
It saves a lot of money so it costs much less so it is correct
( z1 have-quant :ARG1 ( z2 monetary-quantity :ARG2-of ( z3 cost :ARG1 ( z4 enforce ) ) ) :ARG3 ( z5 less :quant ( z6 much ) ) :ARG4 ( z7 product-of :op "1/3" :op ( z8 monetary-quantity :ARG2-of z3 ) ) )