These people are the ones who squandered their money in life on useless things.
Their punishment is to roll large stones, clashing in head-on collisions with
the Avaricious who are trying to go the opposite direction.
These people are the Miserly, who hoarded their money, never giving or sharing
They try to push their stones in one direction at all times, but are
halted by the constant violent collisions with the Prodigious (Spendthrifts).