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Industrial farming techniques will, I suspect, prove to be somewhat more efficient than growing plants in ones loft, hence a lower overall cost of production will be realised.
A lot of the cannabis sold in the UK is already farmed "industrially", using the same tech as commercial growers of legitimate crops.
So it's already efficient and any economies of scale, would be dwarfed by actually having to pay for electricity and no longer being able to use enslaved illegal immigrants etc.
Industrial farming techniques will, I suspect, prove to be somewhat more efficient than growing plants in ones loft, hence a lower overall cost of production will be realised.