85% of the world’s farms are small farms, smaller than 5 hectares
from Casaubon's Book (blog)
5 hectares is 12.35 acres. I've heard that called micro-farming before, like it's a rare thing. But at the same time, it's amazing how much potential there is in a small acreage. Please read the article the quote is from. Good information, and great for getting one thinking.