'Increase' in the Bible

But on the fifth year, you may eat its fruits to increase its produce for you."

If the number of years after the jubilee is more, increase the selling price. If the number of years after the jubilee is few, decrease its selling price, because he's selling to you according to the potential production volume of the land.

"I'll look after you, ensuring that you'll be fruitful. I'll increase your number and keep my covenant with you.