Greater Production is the second upgrade of Path 1 for the Banana Farm in BTD6. It allows the Banana Farm to produce 8 bananas, valuing at $160 when all bananas are collected. It also increases Monkey Bank income per round by +$80 compared to no Path 1 upgrades, as well as Central Markets by +$280 compared to no Path 1 upgrades.
Get this upgrade before getting another Banana Farm. Although a 2-0-0 Farm is less cost-effective than a 1-0-0 Farm by cost, it is actually more efficient in the long-run, as waiting for another 0-0-0 Farm wastes potential for extra banana production.
If there's a good chunk of money, start with placing 1-0-0 Farms before upgrading them to 2-0-0, for the greatest cost-efficiency until higher more efficient upgrades like Monkey Banks or Banana Research Facilities.