Honestly I don't know. The objective answer to your question is because that's how exempt professions is defined for the law.
If I had to hazard a guess but I would suspect it's because people in those professions are expected to be salary. Salary is easier to budget out in longer increments as the base pay amounts per pay period typically don't vary. (annual salary / pay periods = pay amount)
If I had to hazard a guess but I would suspect it's because people in those professions are expected to be salary. Salary is easier to budget out in longer increments as the base pay amounts per pay period typically don't vary. (annual salary / pay periods = pay amount)