$10.$ Why do we consider a business$-$cycle expansion different from long$-$run economic growth? Why do we care about the size of the long$-$run growth rate of real GDP relative to the size of the growth rate of the population?

a$)$ Where was it cheapest to buy a Big Mac in U$.$S$.$ dollars in $2007?$

b$)$ Where was it cheapest to buy a Big Mac in U$.$S$.$ dollars in $2019?$

c$)$ Using the increase in the local currency price of the Big Mac in each country to measure the percent change in the overall price level from $2007$ to $2019,$ which nation experienced the most inflation? Did any of the nations experience deflation?