The study looked at over 450 US banks to see how efficient they are in managing costs and making profits. They found that US banks are better at managing costs than making profits. The global financial crisis hurt profits more than costs. Savings banks are better at managing costs, while commercial banks are better at making profits. Private and public banks are equally efficient. Foreign banks are less efficient than US banks. Smaller banks are more efficient than larger ones. Other factors also affect how well banks manage costs and profits.