In 2019, China's economic growth rate was 6.1% and Chinese households increased their spending. More Chinese people attended sports events and the earnings of top sportspeople increased. China exported more despite a rise in tariffs on some of its products. For example, the US imposed higher tariffs on the imports of Chinese tea and coffee.
a) Identify the opportunity cost of households spending their income and the opportunity cost of Chinese firms exporting goods and services. [2]