Response should be at least 130 words to each individual que

Response should be at least 130 words to each individual question. Each reference must have a link Why is the U.S. banking system called a ‘fractional reserve’ system?How can a bank create money?How do economists integrate the international sector (exports and imports) into the aggregate expenditures model?How do economists integrate the public sector (government expenditures and taxes) into the aggregate expenditures model?