From: The Capitalist; The Case Against Tipping
Tipping is an aristocratic conceit — “There you go, my good man, buy your starving family a loaf” — best left to an aristocratic age. The practicing democrat would rather be told what he owes right up front. Offensively rich people may delight in peeling off hundred-dollar bills and tossing them out to groveling servants. But no sane, well-adjusted human being cares to sit around and evaluate the performance of some beleaguered coffee vendor.
via The Tip Jar Shall be the Downfall of this Great Republic, Evidence from 2012 and 1916-.
We investigated the link between tipping, an altruistic act, and bribery, an immoral act. We found a positive relationship between these two seemingly unrelated behaviors, using archival cross-national data for 32 countries, and controlling for per capita gross domestic product, income inequality, and other factors. Countries that had higher rates of tipping behavior tended to have higher rates of corruption.