There has been a noticeable decline in the labor factor in all wealthy countries in the past 20 years. The rich are getting richer, but those at the lower end aren't moving ahead as quickly as the capitalists.
Cash is very easy to hide. It's easy to hoard. It's easy to move, especially these large bills.
Today, chess programs have become so good that even grandmasters sometimes struggle to understand the logic behind some of their moves.