George Box has said "The only way to find out what will happen when a complex system is disturbed is to disturb the system, not merely to observe it passively." These words of caution about "natural experiments" are uncomfortably strong. Yet in today's world we see no alternative to accepting them as, if anything, too weak.
- by Fred Mosteller and John Tukey, 1977-
Kyung Min Lee
Consultant Economist, Finance, Competitiveness, and Innovation Global Practice of the World Bank Group
Applied Microeconomics, Labor Economics, Firm Dynamics, Innovation, and Entrepreneurship