I suppose people demand not only wage, but also good work environment for working. It can hardly be said that Japanese work environment is good because of law rate of spending paid vacation days and much overtime work hours. According to the study of Reuters, Japanese take least paid vacation of about 16.5 days; moreover, they use only about half of it. On the other hand, French get most vacation of about 34.5, and they take almost of them. This is because that many companies in Japan or business manager are opposed to employee taking a vacation day. For example, if a Japanese employee asks his boss to take a paid holiday, he would say “Do not trouble fellow workers, and your salary appraisal would get worse if you take vacation days”.
In addition, Japanese working time is longer than that of other advanced countries. According to the research of OECD, the average working time of Japanese worker is about 1830 while that of Germany and France are about 1350, and this number does not include unpaid overtime working hour. In Japan, the average annual unpaid working hour is about 250 hours, so the average total annual working hour is over 2000. One of the reasons why the working hour is so long is that many companies recognize not only performance of employee, but also their working hour. Another reason is that Japanese society has a business culture which subordinate officers may not go off work before their boss leave the firm.
The underlying cause of the problem of the Japanese poor working condition is Japanese collective society and Japanese culture which Japanese so not want to go against a person with power.