Final answer:
An avian flu outbreak that sickens millions of workers would decrease the labor force and disrupt supply chains, leading to a decrease in the economy's productive capacity and output.
Step-by-step explanation:
Avian flu is a highly contagious viral infection that primarily affects birds. However, if the avian flu outbreak were to sicken millions of workers, it would have significant effects on the production possibilities frontier (PPF) for goods and services. Firstly, a widespread outbreak of avian flu among workers would result in a decrease in the labor force. This would lead to a decrease in the production capacity of the economy, causing a leftward shift in the PPF curve.
Secondly, the avian flu outbreak could also disrupt supply chains, especially in sectors such as agriculture and manufacturing that heavily rely on labor. Reduced production in these sectors would further limit the economy's ability to produce goods and services, shifting the PPF curve inward.
Overall, the avian flu outbreak's effects on the PPF would result in a decrease in the economy's productive capacity, leading to a decline in output and economic growth.