Medical bills in the United States have risen violently since 1960’s and steps need to be taken to reverse this trend or the average American will not be able to afford medical care. The major factor in increasing the cost of medical care has been the dramatic increase in the cost of hospital services. The rise in the cost of hospitalization can be only partly blamed on inflation (通货膨胀)since hospital bills in the last two decades have risen at a considerably higher rate than inflation.

What is the author’s main point in the passage()