New employees of Ramna Industries are complaining about discomfort caused by excessive noise inside Ramna's factory. Experienced Ramna factory employees, however, do not suffer any such discomfort. Although Ramna accepts responsibility for the health of its employees, it has decided not to issue earplugs to new employees. Ramna reasoned that the new employees would also become accustomed to the noise without using earplugs. Which of the following, if true, indicates a flaw in Ramna's decision not to issue earplugs to new employees?