Q1- You are the owner of a small sandwich shop. A buyer may offer one of several payment methods: cash, a check drawn on a bank, a credit card, or a debit card. Which of these is the least costly for you? Explain why the others are more expensive. Q2- What do you think accounts for the widespread adoption of mobile-based payment services in emerging economies? Q3- Under what circumstances might you expect barter to reemerge in an economy that has fiat money as a means of payment? Q4- If money growth is related to inflation, what would you expect to happen to the inflation rates of countries that join a monetary union and adopt a common currency such as the euro