Problems concerning distribution are global. Unbalanced distribution caused by large distribution gaps and unequal distribution has existed in varying degrees throughout different historical periods around the world. These problems have been highly intertwined with elements of society, economy, politics, law, history, and culture. They have close links to issues like economic crises such as the Great Depression in the 1930s and the global financial crisis in 2008, as well as social crises such as the Ebola outbreak and the COVID-19 pandemic.