While 2020 was a challenging year, 2021 is set to be equally challenging with the emergence of multiple variants of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), new SARS-CoV-2 variants 501Y.V1 (B.1.1.7) in the UK and 501Y.V2 (B.1.351) in South Africa. The arrival of vaccines and...

Vilfredo Pareto was a late nineteenth‐century economist/sociologist who first noted and reported his observation that about 80 percent of wealth was concentrated in about 20 percent of a population. This is the basis for what we now call the Pareto Principle.