The more villagers you have doing a task, the faster the task will get done.
With building, more builders, the better.
With Farmers, you see it how the villagers always have enough to eat. If you have a large population and only one farmer, they're probably going to starve. One person cannot collect food fast enough for 70, 80, 90 people.
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My VV2 story, "A Twist of Fate" And don't miss Krystal's stories, all three of them!
"Life is too fast... unless you're in traffic."