Megalania

"It is possible for such countries to have high material standards of living if primary produce prices are high. Examples given include Uruguay (in the 1950s) and New Zealand. However, a narrow export base makes these economies vulnerable to outside pressures. Assuming that agricultural prices are high, the value of a country's currency is high. Thus imports (most of which are consumed by the city) are thus cheaper. "

Cities and the Wealth of Nations: Principles of Economic Life