The old-fashioned dictator does not exist under scientific management. The man at the head of the business under scientific management is governed by rules and laws which have been developed through hundreds of experiments just as much as the workman is.
The beauty of instrumental variables is that they allow us to see the world in a new light.
"Hope is the only thing stronger than fear."
不要让恐惧阻止你做你想做的事。
你的气场会吸引你的同类。