It serves as a filter for air on inhalation. You normally don’t even know you have mucus until you have caught a cold. Depending on how bad the cold is, you not only know about mucus it will become a major problem dealing with it. Like how to not have to wear pull-ups. It is...
resource endowments or other 'unearned' income (such as foreign aid) were not reliant on taxing their people, but instead served to allocate or distribute the revenues, and that this would create a large unnecessary bureaucracy while reducing the incentives for hard work and government ...