steel tray ready to be stuffed with ruby-red tuna or smoked eel. shortage. Among its customers is Whole Foods. the U.S. economy-64\% of gross output last year, up from 40% in the 1950 s-but their share of capital expenditures has been relatively flat over time. R&D) has surpassed 4% of GDP. them obsolete. Customization-inserting different kinds of filling-still requires humans. Critical Thinking Questions 1. Why does the sushi robot make sense? A. It costs less than other machines. B. It is faster than a human. C. It replaces humans altogether. D. It never rusts out. 2. Services make up what percent of the U.S. economy? A. 40% B. 64% C. 4% D. 90% 3. The robot can A. produce four times as many sushi rolls as a human worker. B. make the sushi chef obsolete. C. produce three times as many sushi rolls as a human worker. D. produce twice as many sushi rolls as a human worker