It is complicated. Raw leafy greens are now a major disease vector since they can come into contact with animal waste during processing and the safety of animal protein has improved dramatically over the past few generations. This leads to sudden "oh fuck, destroy the entire crop" situations that spike prices. That's bad.

But... there is no question that industrialized agriculture keeps the price of lettuce lower on average than non-industrialized approaches. If you are just watching prices, the trade is still positive.