That verse you posted said 7x7 years, so every 49 years, with one year off after, so a 50 year cycle. Then I guess they “buy” land throughout the next 50 year cycle based on how many years remain. Ie, if it’s 25 years into the cycle, the price for a field might be half off. Not a terrible system really, for the age. At the end of the cycle, it all goes back to the “clan” to be resold again.