_____________ rhythms are the daily rhythmic activity cycles, based on 24-hour intervals, that humans experience

The production possibilities frontier separates ________

A) the goods and services that people want from those that they do not want B) the types of goods that can be attained from those that can't be attained C) the quantities of goods and services that can be produced from those that cannot be produced D) the combinations of goods that people value and those that they don't

Infant industry protection requires

A) a positive technological externality. B) a national security externality. C) time limited protection. D) Both A and B. E) Both A and C.