While this reflects temporary factors such as a reduction in charges for mobile phone services, this is mainly attributable to the fact that the mindset and behavior based on the assumption that wages  4  and prices will not increase easily have been deeply entrenched among firms and households.
As evidence of such mindset and behavior, firms have been limiting wage increases -- which correspond to the labor shortage -- mainly to part-time employees, and it is taking time for such increases to spread to full-time employees.