In response to the COVID-19 pandemic, governments around the world have spent a lot of money to stimulate their economies. What are the theories that give support to the adoption of these economic-stimulus packages?

In response to the COVID-19 pandemic, governments around the world have spent a lot of money
to stimulate their economies. What are the theories that give support to the adoption of these
economic-stimulus packages? Discuss the effectiveness of those measures and recommend the
way forward.