Black swans notwithstanding, 2021 should be a good year, according to results of the latest McKinsey Global Survey on the economy. Executives are ending a year of global crisis and profound uncertainty on a relatively positive note. Their predictions for the future, and for their own companies’ prospects, remain much more optimistic than not. Executives in Europe, North America, and developing markets report more acute concerns than others about the economy, and those in Europe remain especially...