The 1920s and the 2020s share some interesting economic similarities. Below, I present some of the most notable similarities:

*1920: The "New Era"

1. *Technological boom*: The 1920s saw an unprecedented technological boom, with the introduction of radio, television, aviation, and automobiles.

2. *Economic growth*: The U.S. economy experienced rapid growth, with a GDP growth rate of 4.2% per year.

3. *Increase in inequality*: As the economy grew, income inequality also increased, with the wealthy accumulating a greater share of the wealth.

*2020: The "Fourth Industrial Revolution"*

1. *Technological boom*: The 2020s are witnessing a similar technological boom, with the introduction of artificial intelligence, blockchain, virtual reality, and the Internet of Things (IoT).

2. *Economic growth*: The global economy has experienced moderate growth, with a GDP growth rate of 3.2% per year in 2020.

3. *Increase in inequality*: Just like in the 1920s, income inequality has increased in the 2020s, with the wealthy accumulating a greater share of the wealth.

*Additional similarities*

1. *Increase in debt*: In both decades, there has been a significant increase in debt, both at the governmental and individual levels.

2. *Financial instability*: The 1920s were marked by speculation and financial instability, which ultimately led to the crash of '29. Similarly, the 2020s have seen an increase in financial instability, with the COVID-19 pandemic and the trade war between the United States and China.

3. *Demographic change*: In both decades, there has been a significant demographic change, with an increase in the urban population and a decrease in the rural population.

there are some interesting similarities, including the technological boom, economic growth, increasing inequality, and instability.