Difference between Italy & USA

An American professor was on sabbatical in Rome. Everyday through his kitchen window, he observed two stone masons dutifully building a wall. After 6 months, the wall was nearly complete. The professor introduced himself to the masons and told them how much he admired their beautifully made wall. He also explained that in the States an army of guys would have finished this work in two weeks. The professor wanted to know how the masons were able to make any money since it took them so long. Where upon the dumbfounded masons asked the professor, "how do YOU make any money if the wall is finished in two weeks?"