Bartering is king. You put up my wall and I'll give you my olive oil.
Fresh olive oil in mass quantities, fresh veggies, homemade wines and hooch, fresh fish...
....lot of home made jam, vinegar, and veggies & herbs.... now fattening up this years crop of goats for relocation to the freezer.
I lived on Ikaria for some years.
FReep mail me in 30 years and if I don't reply you will know it doesn't work.