Places where learning was preserved during feudalism

Monasteries were places where learning was preserved during feudalism.  Some Monasteries served as libraries,  Monks studied the scriptures, they wrote and read ancient books.  Schools and universities were run by the church in the 11th and 12th centuries.   Medieval libraries depended on manuscripts, the Church administered the business of copying books, the content of books was preserved by copied manuscripts.  

"choosing is refusing" means individuals face an opportunity cost with each decision they make. economists state that every decision involves trade-offs. opportunity cost is the least desirable alternative given up as a result of a decision.