Samuelson taught that Multiplier = 1 / (1 - MPC) . An updated PDF will apply this to COVID-19 stimulus payments (2020-2023). Compare the 2008 stimulus multiplier (≈1.5) to the 2021 stimulus (≈2.3). This is the "updated" analysis you need.
New content covers the aftermath of the COVID-19 pandemic , global supply chain disruptions, and the rise of digital economies and cryptocurrencies.