Marcus enjoys wielding power over McTeague, though he knows it could easily slip from his grasp. Although the two men hate each other, they temporarily have to work together to calm the mule, lest they both perish in the desert. Notably, before he bothers to ask for water, which he desperately needs, Marcus asks for the $5,000. This suggests that money is the most important resource in his mind, a false assumption given his present circumstance.