By Edward Hadas
The author is a Reuters Breakingviews columnist. The opinions expressed are his own.
The reality of 'political economy' is something that irritates many economists -- the "purists", if you like. The political element is impossible to model; it often flies in the face of textbook economics; and democratic decision-making and backroom horse trading can be notoriously difficult to predict and painfully slow. And political economy is all pervasive in 2010 -- Barack Obama's proposals to rein in the banks is rooted in public outrage; reading China's monetary and currency policies is like Kremlinology; capital curbs being introduced in Brazil and elsewhere aim to prevent market overshoot; and British budgetary policies are becoming the political football ahead of this spring's UK election. The list is long, the outcomes uncertain, the market risk high.