Final answer:
Tier 1 Schools may be those that receive particular resources based on federal funding guidelines, which could influence Scholastic's ability to sell certain materials.
Step-by-step explanation:
The question refers to Scholastic's sales restrictions related to educational materials for Tier 1 Schools. Tier 1 Schools are likely those with specific educational standards or funding qualifications that determine the types of resources they can acquire. For instance, the Supreme Court ruling in Agostini v. Felton allowed for federal aid to be used in private religious schools for teaching secular subjects. Also, when a primary/secondary (elementary/high) school is private, governments might supply vouchers to support private education. Additionally, it's notable that the most popular textbooks are often in high demand by students, which can make them less available online due to depleted supplies.