The amount of discipline a parent (limited by the time and willpower a parent can input into the process) can impose is finite. Once we accept this hypothesis, we can see how usual norms are imposed by parental discipline plus non-parental discipline. A parent going against a norm will have to use an extraordinary amount of time and willpower to impose his unconventional norm, as he will lack the enforcement of the non-parent actors. Eating sugary cereal is a societal norm in today&#x27;s developed countries. Therefore, a parent wishing to diverge from this norm would have to expend an extraordinary effort.<p>He&#x27;s also going against the professionals who already succeeded in imposing the norm and simply have to maintain it today.