Final answer:
It is advisable to use credit during poor economic times for essential expenses, such as emergency medical expenses. However, it is not a good practice to use credit for luxury items or when facing uncertain financial prospects.
Step-by-step explanation:
When it is advisable to use credit during poor economic times: It is advisable to use credit when needing immediate funds for essential expenses, such as emergency medical expenses. This can help cover necessary costs when facing financial difficulties.
When it is not a good practice to use credit during poor economic times: It is not advisable to use credit when facing uncertain financial prospects or to purchase luxury items.