“The absurdity of public-choice theory is captured by Nobel Prize-winning economist Amartya Sen in the following little scenario: "Can you direct me to the railway station?" asks the stranger. "Certainly," says the local, pointing in the opposite direction, towards the post office, "and would you post this letter for me on your way?" "Certainly," says the stranger, resolving to open it to see if it contains anything worth stealing.”
Source : Linda McQuaig (2001). “All you can eat: greed, lust, and the new capitalism”, Viking