Final answer:
A retail bank contributes to economic growth by offering affordable mortgage loans to home buyers, creating money in the economy through lending, and facilitating a range of essential transactions.
Step-by-step explanation:
A retail bank helps drive economic growth primarily by offering affordable mortgage loans to home buyers. This action fits into the broader context of how banks operate: by holding only a fraction of their deposits as reserves, banks are able to lend money. The process of lending, followed by those funds being redeposited and lent out again, effectively creates money in the economy. In addition to personal loan services, banks facilitate a vast range of transactions in goods, labor, and financial capital markets, providing the needed infrastructure for an economy to function smoothly without solely relying on cash transactions. Banks attract depositors and borrow from other banks or the central government-operated bank, like the Federal Reserve in the United States, to acquire the money that they need to lend out. They also invest in various financial instruments to earn higher rates of return.