Political economy is indeed a science, a type of knowledge (savoir), a mode of knowledge (connaissance) which those who govern must take into account. But economic science cannot be the science of government and economics cannot be the internal principle, law, rule of conduct, or rationality of government. Economics is a science lateral to the art of governing. One must govern with economics, one must govern alongside economists, one must governby listening to the economists, but economics must not be and there is no question that it can be the governmental rationality itself.

Michel Foucault, The Birth of Biopolitics, loc. 1467