Economists have long argued that they shouldn’t be expected to predict crises, such as the one that almost sank the global economy five years ago.
That depends on how you define the word “predict.”...
The answer is that predictions can be useful without being quite so precise. Scientists make valuable predictions all the time that have little to do with foreseeing the future, but develop our understanding of cause and effect....
In this sense of a causal relationship, quite a few people did foretell the financial crisis....
The challenge for economists is to find those indicators that can provide regulators with reliable early warnings of trouble....
One problem has been “physics envy” -- a longing for certainty and for beautiful, timeless equations that can wrap up economic reality in some final way. Economics is actually more like biology, with perpetual change and evolution at its core. This means we’ll have to go on discovering new ways to identify useful clues about emerging problems as finance changes and investors jump into new products and strategies. Perpetual adaptation is part of living in a complex world.
Bloomberg
Actually, Economists Can Predict Financial CrisesMark Buchanan, theoretical physicist
(h/t Mark Thoma at Economist's View