What was bad about this deal?

The land-greedy peasant Pahom thinks he's made the bargain of the century with the seemingly naive Bashkirs. Their chief has told Pahom that he can have as much land as he can walk around in one day. And all for the knockdown price of one thousand rubles. But there's one condition: Pahom needs to return to the exact point where he started.
Pahom thinks he's got the better of the deal; all that land for a hardly anything. What an unbeatable bargain! Unfortunately, however, his greed gets the better of him, and in his frenzied desire to grab as much land as possible, dies in the attempt. Despite his astute business brain and experience in the acquisition of land, it's fair to say that Pahom ends up losing out on the deal. And all because he got too greedy. How much land did Pahom really need? Just enough to bury him in, the same as everyone else.